{"product_id":"nh34-gmt-movement","title":"NH34 GMT Automatic Movement","description":"\u003cp\u003eThe Seiko NH34 is the only affordable automatic GMT movement available for Seiko modding. Manufactured by TMI (Time Module Inc.), a subsidiary of Seiko Instruments, the NH34 adds a true 24-hour GMT hand to the proven NH35 platform, allowing you to track a second time zone on a GMT bezel. It retains the 21,600 bph frequency, 24 jewels, 41-hour power reserve, hacking seconds, and hand-winding that define the NH family. If you want GMT functionality in a Seiko mod without spending hundreds on a Swiss caliber, this is your movement.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCaliber\u003c\/td\u003e\n\u003ctd\u003eSeiko NH34A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e21,600 bph (6 beats per second)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJewels\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Reserve\u003c\/td\u003e\n\u003ctd\u003e41 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHacking\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHand-Winding\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDate\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGMT\u003c\/td\u003e\n\u003ctd\u003eYes (24-hour hand)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStem Position\u003c\/td\u003e\n\u003ctd\u003e3 o’clock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotor\u003c\/td\u003e\n\u003ctd\u003eBidirectional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe NH34 shares the same case mounting dimensions as the NH35 family, so it fits every Nomods case: Royal Oak 37 mm, Royal Oak 41 mm, Petrichor, and Seikonaut. The key difference is the additional GMT hand, which requires a fourth hand to be installed during assembly. Use the NH34 with dials that have 24-hour markings or GMT-style bezels for full GMT functionality, though the movement works with any compatible dial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDial sizes:\u003c\/strong\u003e 28.5 mm dials for the Royal Oak 37 mm and Petrichor cases · 30.8 mm dials for the Royal Oak 41 mm and Seikonaut cases\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHands:\u003c\/strong\u003e Requires a four-hand set (hour, minute, seconds, GMT). All Nomods NH-series hands are compatible, plus the additional GMT hand.\u003c\/p\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeiko NH34A movement (fully assembled with rotor)\u003c\/li\u003e\n\u003cli\u003eStem\u003c\/li\u003e\n\u003cli\u003eMovement specification sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy This Movement\u003c\/h2\u003e\n\u003cp\u003eThe NH34 fills a gap that no other movement in this price range can: affordable automatic GMT. Before TMI released the NH34, getting a GMT complication in a Seiko mod meant either a quartz GMT module or spending several hundred dollars on a Swiss movement. The NH34 puts a true 24-hour GMT hand on the dial at the same price as a standard NH35, making traveler-style builds accessible to anyone. Nomods uses the NH34 in builds where customers want to track two time zones, and it pairs particularly well with GMT bezel inserts for a complete Pepsi, Batman, or Coke aesthetic.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv itemscope itemtype=\"https:\/\/schema.org\/FAQPage\"\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eHow does the GMT function work on the NH34?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\"\u003e\u003cp\u003eThe NH34 adds a fourth hand that completes one full rotation every 24 hours. You read it against a 24-hour scale on the bezel or dial to track a second time zone. The local hour hand can be set independently by pulling the crown to the first position and turning it, so you can adjust for time zone changes without losing your GMT reference.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWill the NH34 fit the same cases as the NH35?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\"\u003e\u003cp\u003eYes. The NH34 has the same external dimensions and mounting points as the NH35, so it drops into every Nomods case — Royal Oak 37 mm, Royal Oak 41 mm, Petrichor, and Seikonaut. The only assembly difference is the extra GMT hand that needs to be installed alongside the standard hour, minute, and seconds hands.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eHow accurate is the NH34 GMT movement?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\"\u003e\u003cp\u003eThe factory specification is ±20 seconds per day, the same as the rest of the NH family. The GMT complication does not affect timekeeping accuracy. As with all NH movements, a watchmaker can regulate the movement for tighter tolerances if desired.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eComplete Your Build\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-gb\/products\/royal-oak-37mm-case-silver\"\u003eRoyal Oak 37 mm Case (Silver)\u003c\/a\u003e — octagonal integrated case for 28.5 mm dials\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-gb\/products\/seikonaut-40mm-case-silver\"\u003eSeikonaut Nautilus Case\u003c\/a\u003e — nautilus-style case for 30.8 mm dials\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-gb\/collections\/seiko-mod-dials\"\u003eDials\u003c\/a\u003e — pair with a GMT-marked dial for full second-timezone functionality\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-gb\/collections\/seiko-mod-hands\"\u003eHands\u003c\/a\u003e — four-hand sets (hour, minute, seconds, GMT) for the NH34\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBrowse all \u003ca href=\"\/en-gb\/collections\/watch-movements\"\u003ewatch movements\u003c\/a\u003e · \u003ca href=\"\/en-gb\/collections\/seiko-mod-movements\"\u003eSeiko mod movements\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNomods 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.\u003c\/em\u003e\u003c\/p\u003e","brand":"Nomods","offers":[{"title":"Default Title","offer_id":41590343368794,"sku":"NH34-M","price":99.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/2151\/4074\/files\/nomods-seiko-nh34-gmt-automatic-movement-tmi-1190706669.jpg?v=1756820886","url":"https:\/\/nomods.co\/en-gb\/products\/nh34-gmt-movement","provider":"Nomods","version":"1.0","type":"link"}