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That exists, in the SBGE211G (41mm) and SBGJ203G (40mm but very thick):
https://www.grand-seiko.com/uk-en/collections/sbge211g
https://www.grand-seiko.com/uk-en/collections/sbgj203g
The difference with these new ones is they're lumed as per other GS sports models, but without being the size of a large dive watch. Don't know what the thickness is going to be but it makes me hopeful for more smaller/thinner GSs generally in the future.
Let’s see if I can get threatened with a takedown for these leaked pics like I did with the 5 Sports.
40mm GS spring drive GMTs (down from the 44mm of the other Sports GMTs they do). Non rotating bezel. Shame about the rotate-a-date still. Available next year apparently.