Miyota Caliber 9075

Brand	Miyota
Caliber Number	9075
Movement Type	Automatic
Lignes	11.5”’
Diameter	26mm
Height	3.9mm
Jewels	24
Beat Rate	28,800 vph, 4Hz
Lift Angle	51 degrees (needs confirmed)
Power Reserve	~42 hours
Anti-Shock System	Parashock
Winding Direction	Uni-directional (clockwise)
Hand Windable?	Yes
Hands Count	4
Functions	Central hours; central minutes; central sweeping seconds; central GMT hand; date at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Japan
Known Models	LIP Nautic Ski GMT, Jack Mason Strat-o-timer GMT, BOLDR Odyssey 44 Freediver GMT, Bulova Classic Wilton GMT (Ref: 96B385, 96B387, 97B210) (Add your watch to the comments below…)

The Miyota caliber 9075 is an affordable automatic “true” GMT movement with 24 jewels and a hi-beat rate of 28,800 bph. It is a member of the 9100 family (9 series) of Miyota calibers that the manufacturer categorizes as “Premium Automatic” movements.

True / Travel GMT:

Setting the local time and GMT on the 9075 is similar to luxury multi-timezone watches such as the popular Rolex GMT-Master II (cal. 3185). The watch community often refers to this type of movement as a true GMT or traveller GMT because the main hour hand is independently adjustable (aka jumping hour hand) for easily changing the current time while crossing (er… jumping) time zones.

As BOLDR puts it:

“Whilst crossing time zones, simply adjust the hour hand independently from the GMT and minute hand and the date will follow, ensuring precision timekeeping anywhere in the world. Stay in the zone, adventurers.” –source

How to set the time?

The crown on 9075 powered watches has 3 positions:

• Position 0: Crown against the case (if the watch has a screw-down crown, this is the position the crown is in immediately after unscrewing the crown) – Manual-winding.
• Position 1: Crown pulled out one click – Adjusts the hour hand (main hours), adjusts the date.
• Position 2: Crown pulled out two clicks – Adjusts the time (main hours/minutes/GMT), hacked seconds.

Accuracy:

Miyota claims that the caliber 9075 offers accuracy of -10 ~ +30 seconds per day. This is measured within 10-60 minutes from a full wind via the crown. Winding the crown 15-20 times will get the seconds hand to start moving. To fully wind the movement, turn the crown ~40 times. You will get better accuracy results from a full wind.

Jewel Count:

There was a previous mix up on jewel count. This caliber has 24 jewels as does its base caliber the 9015. You may see this movement listed with 26 jewels, still trying to find the source of that. As of 1/23, Miyota still does not have a listing for this watch and no official documentation is available yet. Therefore, an actual watch was purchased by Caliber Corner for the sole reason of confirming the jewel count and it remains at 24. More photos/video soon.

Replacement Prices:

At the time of this post, replacement prices for the Miyota 9075 are unavailable. This will be updated when there is more information.

Examples of watches with this movement:

One of the earliest watches publicized to be carrying the calibre 9075 was the Bulova Classic Wilton GMT, introduced on July 15, 2022. It makes sense that Bulova be the first to have such an important addition to the Miyota lineup since Bulova and Miyota are both owned by the Japan based conglomerate Citizen Watch Co. Ltd.

But even before the Bulova was releases, Twitter user @BelleMecanique_ posted an image of the LIP Nautic Ski Auto GMT 41 as far back as October 21, 2021. Perhaps LIP was the first. The interesting question is, did LIP request such a movement from Miyota or did Miyota approach them with the offering first?

https://twitter.com/BelleMecanique_/status/1451636711335804930

Still, at the time of this post, there aren’t many brands using the Miyota 9075. It is still a very early movement and is not even publicized on Miyota’s official site yet. To give you a better idea of the availability, watches with this movement are in pre-order stages with delivery estimates as far off as March 2023 (Jack Mason Strat-o-timer GMT). As for pricing, the few 9075 powered timepieces that are on the market have pre-order pricing at around $899 USD – $1,050 USD range.

Does Seiko have a similar movement?

The closest thing Seiko has to Miyota’s 9075 may be the caliber NH34A. It is also an affordable (more affordable actually) automatic GMT movement. The main difference between the Miyota and Seiko GMTs is that the Miyota is a true/traveller’s GMT (the main hour hand is set independently) and the Seiko is a caller/office GMT (the GMT/24 hour hand is set independently).

Additional Resources:

• Official Miyota 9075 tech drawings (pdf) coming soon
• Miyota list of movements