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The ETA GMT movement is very widely used. It’s in the Farer GMTs, the Bell & Ross, etc.
It’s thin and reliable but the quick-set jumping hour functionality is on the GMT hand (like the original GMT-Master), not the local hour hand (like the GMT-Master II). People on the internet seem to get in a tizz about that.
The Tudor GMT movement has the “superior” jumping local hour hand, but they have also had a lot of issues with the date not changing properly on them. They had to take a lot of them back to be fixed (which has probably made the supply issues even worse). So I wouldn’t expect a BB58 GMT for a good while, if it ever happens.
Actually I could see them making a second (third?) generation BB before that, with the same basic dimensions as the current one, just thinner.
Wow, good spot. So you can buy an OTP movement with GMT and date that is thinner than ththe BB58 movement.
I’d say there will definitely be a GMT version coming although Tudor normally drip release their new versions and from memory it took hem a few years to release the BB GMT.