Spare Caseback for Royal Oak 37mm Seiko Mod

Name: Spare Caseback – Royal Oak 37mm
Brand: Nomods
SKU: RO37-CB-RSG
Price: 26.95 EUR
Availability: InStock

Nomods Silver Royal Oak 37mm Seiko Mod Spare Caseback

Nomods Gold Royal Oak 37mm Seiko Mod Spare Caseback

Nomods Gun metal Royal Oak 37mm Seiko Mod Spare Caseback

Nomods Black PVD Royal Oak 37mm Seiko Mod Spare Caseback

Nomods Rose gold Royal Oak 37mm Seiko Mod Spare Caseback

€26,95

Color — Rose gold

Low stock - 5 items left
Backordered, shipping soon

Complete Your Build

Replacement caseback for the Royal Oak 37mm V2 Ultrathin Seiko mod case. Available in rose gold, gold, gunmetal, and black PVD finishes to match your case color. Each caseback is machined from 316L stainless steel with the same PVD coating as the original. Includes a fresh caseback gasket to maintain the case’s 100 m water resistance rating after installation.

Specifications

Specification	Value
Compatible Case	Royal Oak 37mm V2 Ultrathin
Material	316L Stainless Steel
Finish Options	Rose gold PVD, Gold PVD, Gunmetal, Black PVD
Type	Solid caseback (screw-down)
Water Resistance	Maintains 100 m when gasket is seated correctly

Compatibility

This caseback fits the Royal Oak 37mm V2 Ultrathin case only. It is not compatible with the Royal Oak 41mm case, the Nautilus case, or other Seiko mod case platforms. Select the finish that matches your case: rose gold, gold, gunmetal, or black PVD.

What’s Included

Solid caseback (316L stainless steel, PVD finish per variant)
Caseback gasket

Caseback opener tool is not included.

Frequently Asked Questions

What cases does this caseback fit?

This caseback is designed exclusively for the Royal Oak 37mm V2 Ultrathin case. It will not fit the Royal Oak 41mm case, Nautilus case, Petrichor case, or any other Seiko mod case.

Does it come with a gasket?

Yes. A fresh caseback gasket is included. Always replace the gasket when swapping casebacks to maintain the 100 m water resistance rating. Seat the gasket evenly before screwing the caseback into place.

Browse all Royal Oak 37mm cases · Recommended with 37mm Royal Oak · Royal Oak parts · All cases

Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.

[{"id":41617829363802,"title":"Rose gold","option1":"Rose gold","option2":null,"option3":null,"sku":"RO37-CB-RSG","requires_shipping":true,"taxable":true,"featured_image":{"id":33710888976474,"product_id":7371673829466,"position":5,"created_at":"2025-01-07T13:23:16+01:00","updated_at":"2025-05-26T10:30:06+02:00","alt":"Nomods Rose gold Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-rose-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983367.png?v=1748248206","variant_ids":[41617829363802]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Rose gold","public_title":"Rose gold","options":["Rose gold"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Rose gold Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930265178,"position":5,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-rose-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983367.png?v=1748248206"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":41617829396570,"title":"Gold","option1":"Gold","option2":null,"option3":null,"sku":"RO37-CB-GLD","requires_shipping":true,"taxable":true,"featured_image":{"id":33710889009242,"product_id":7371673829466,"position":2,"created_at":"2025-01-07T13:23:15+01:00","updated_at":"2025-05-26T10:30:16+02:00","alt":"Nomods Gold Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983370.png?v=1748248216","variant_ids":[41617829396570]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Gold","public_title":"Gold","options":["Gold"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Gold Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930166874,"position":2,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983370.png?v=1748248216"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":41617829429338,"title":"Gun metal","option1":"Gun metal","option2":null,"option3":null,"sku":"RO37-CB-GUN","requires_shipping":true,"taxable":true,"featured_image":{"id":33710889107546,"product_id":7371673829466,"position":3,"created_at":"2025-01-07T13:23:15+01:00","updated_at":"2025-05-26T10:30:12+02:00","alt":"Nomods Gun metal Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-gun-metal-royal-oak-37mm-seiko-mod-spare-caseback-1169983369.png?v=1748248212","variant_ids":[41617829429338]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Gun metal","public_title":"Gun metal","options":["Gun metal"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Gun metal Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930199642,"position":3,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-gun-metal-royal-oak-37mm-seiko-mod-spare-caseback-1169983369.png?v=1748248212"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":41617829462106,"title":"Black PVD","option1":"Black PVD","option2":null,"option3":null,"sku":"RO37-CB-BLK","requires_shipping":true,"taxable":true,"featured_image":{"id":33710889074778,"product_id":7371673829466,"position":4,"created_at":"2025-01-07T13:23:16+01:00","updated_at":"2025-05-26T10:30:09+02:00","alt":"Nomods Black PVD Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-black-pvd-royal-oak-37mm-seiko-mod-spare-caseback-1169983368.png?v=1748248209","variant_ids":[41617829462106]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Black PVD","public_title":"Black PVD","options":["Black PVD"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Black PVD Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930232410,"position":4,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-black-pvd-royal-oak-37mm-seiko-mod-spare-caseback-1169983368.png?v=1748248209"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":41617829494874,"title":"Silver","option1":"Silver","option2":null,"option3":null,"sku":"RO37-CB-SIL","requires_shipping":true,"taxable":true,"featured_image":{"id":33710889042010,"product_id":7371673829466,"position":1,"created_at":"2025-01-07T13:23:16+01:00","updated_at":"2025-05-26T10:30:04+02:00","alt":"Nomods Silver Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-silver-royal-oak-37mm-seiko-mod-spare-caseback-1169983366.png?v=1748248204","variant_ids":[41617829494874]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Silver","public_title":"Silver","options":["Silver"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Silver Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930297946,"position":1,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-silver-royal-oak-37mm-seiko-mod-spare-caseback-1169983366.png?v=1748248204"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

{"id":41617829363802,"title":"Rose gold","option1":"Rose gold","option2":null,"option3":null,"sku":"RO37-CB-RSG","requires_shipping":true,"taxable":true,"featured_image":{"id":33710888976474,"product_id":7371673829466,"position":5,"created_at":"2025-01-07T13:23:16+01:00","updated_at":"2025-05-26T10:30:06+02:00","alt":"Nomods Rose gold Royal Oak 37mm Seiko Mod Spare Caseback","width":1425,"height":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-rose-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983367.png?v=1748248206","variant_ids":[41617829363802]},"available":true,"name":"Spare Caseback – Royal Oak 37mm - Rose gold","public_title":"Rose gold","options":["Rose gold"],"price":2695,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":"Nomods Rose gold Royal Oak 37mm Seiko Mod Spare Caseback","id":25812930265178,"position":5,"preview_image":{"aspect_ratio":1.0,"height":1425,"width":1425,"src":"\/\/nomods.co\/cdn\/shop\/files\/nomods-rose-gold-royal-oak-37mm-seiko-mod-spare-caseback-1169983367.png?v=1748248206"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

Spare Caseback – Royal Oak 37mm

€26,95

Nomods vs Others

	NOMODS	Others
Premium 316L Stainless Steel
Sapphire Crystal Glass
Precision Machined Components
30-Day Money Back Guarantee
Free Shipping Over $100
Quality Control Testing
Community Support
6-month parts / 2-year build warranty

Choose quality and precision. Choose Nomods.

Latest from Our Blog

MoonSwatch Modding vs Seiko Modding: What You Can Customize

Swatch just dropped an Audemars Piguet collaboration — the bioceramic "Royal Pop," a roughly $400 pocket-watch riff on the Royal Oak — and watch forums...

May 16, 2026

Seiko Black Bay Mod: The Tudor Vintage Diver Guide

Tudor Black Bay is what Rolex looks like when it stops trying to be expensive. The Heritage line takes 1950s-and-1960s Tudor military divers — snowflake...

May 10, 2026

Seiko Tank Mod: The Cartier Rectangular Alternative

A Seiko Tank mod is a Seiko-movement watch dressed in a rectangular Cartier-Tank-styled case, dialed and handed to evoke the most iconic dress watch of...

May 10, 2026

Seiko Aquanaut Mod: The Patek Sport Alternative Guide

A Patek Philippe Aquanaut on the wrist runs $20,000 to $35,000. A Seiko-platform Aquanaut mod — the same rounded cushion case, the same rubber strap,...

May 10, 2026