I think the BB58 movement is 6.5mm thick so theyd struggle to fit a GMT and date into the case. GMT only, poooossibly. Then again, no reason why they can't add a mm or so to the case.
According to this the ETA 2893-2 which has GMT hand and date is 4.1mm thick
https://www.eta.ch/en/our-products/mechanical-movements/mecaline-specialities/eta-mecaline-specialities-2893-2
@Stonehedge started
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I think the BB58 movement is 6.5mm thick so theyd struggle to fit a GMT and date into the case. GMT only, poooossibly. Then again, no reason why they can't add a mm or so to the case.