Unraveling the Intricacies of the Miyota 9075 GMT Movement

If you're a watch enthusiast, you'll agree that the beating heart of any timepiece is its movement. It's the intricate mechanism that powers the watch, moving its hands, and providing its various functions. Today, we're going to delve into a lesser-known yet intriguing movement: the Miyota 9075 GMT.

Introducing the Miyota 9075 GMT Movement

Hailing from Japan, the Miyota 9075 GMT is an automatic movement that is part of the prestigious 9100 family (9 series) of Miyota calibers. The manufacturer categorizes this movement as a "Premium Automatic," indicative of its superior quality and functionality​¹​.

Boasting 24 jewels and a high beat rate of 28,800 vibrations per hour (bph), the Miyota 9075 GMT offers an impressive blend of precision and durability. It also exhibits a commendable power reserve of approximately 42 hours, ensuring that your watch keeps ticking even when it's off your wrist for a while​¹​.

The True GMT Feature

What sets the Miyota 9075 GMT apart is its "true" GMT feature. In watch parlance, a "true" GMT movement allows the main hour hand to be adjusted independently. This feature is particularly beneficial for frequent travelers or those operating across different time zones.

The independent adjustability of the hour hand makes the Miyota 9075 GMT akin to luxury multi-timezone watches like the Rolex GMT-Master II. While traversing time zones, you can easily adjust the hour hand, independent of the GMT and minute hand. Additionally, the date follows the adjusted hour hand, ensuring you keep track of the date accurately irrespective of your geographic location​¹​.

Technical Specifications of the Miyota 9075 GMT Automatic Movement

We can find below the technical specifications of the Miyota 9075 GMT

• Display of hours with true GMT function, minute, center second (hacking), date, 24 h display
• No date quickset, but semi quickset via hour jumps of the GMT function
• Automatic, unidirectional winding, manual winding possible
• Diameter 11 1/2´´´ (French lines) = 26 mm, height approx. 4.95 mm
• 28,800 vibrations/hour
• Power reserve approx. 42 hours
• Lever escapement
• 24 jewels
• Glucydur balance
• Shock protection Citizen Parashock
• Lifting angle 51°

Setting the Time

The crown on Miyota 9075 powered watches has three positions, each serving a different purpose:

1. Position 0: Crown against the case – This is for manual winding.
2. Position 1: Crown pulled out one click – This adjusts the hour hand (main hours) and the date.
3. Position 2: Crown pulled out two clicks – This adjusts the time (main hours/minutes/GMT) and hacks the seconds​¹​.

Accuracy and Winding

Miyota claims that the caliber 9075 offers an accuracy of -10 ~ +30 seconds per day. The accuracy is measured within 10-60 minutes from a full wind via the crown. To get the seconds hand moving, wind the crown 15-20 times. For a full wind, turn the crown approximately 40 times. It's recommended to fully wind the movement for better accuracy results​¹​.

Availability and Usage

Despite its impressive features, the Miyota 9075 GMT is not widely utilized yet. It's still a relatively new movement and is not even publicized on Miyota's official site. Watches featuring this movement are currently in the pre-order stages, with delivery estimates as far off as March 2023.

The few 9075 powered timepieces that are on the market have pre-order pricing in the $500 USD – $1,050 USD range​¹​ being the Borealis Estoril 300 GMT one of the most affordable options available.

Conclusion

The Miyota 9075 GMT is a testament to Miyota's craftsmanship and innovation in the realm of watch movements. Its true GMT functionality, high beat rate, and precision make it a compelling choice for watch enthusiasts and manufacturers alike.

As this movement becomes more mainstream, we look forward to seeing more timepieces leveraging its unique features.