That’s the SBGW231, with a strap swap. It’s a bit of an outlier for Grand Seiko in that it’s manual wind, no date, 37mm in diameter and a sensible thickness (11.6mm).
There are auto (with date) and GMT variants, kind of. They’re larger, as you might expect. Look at the SBGJ217 (hi-beat) and SBGM221 (auto, also weird stumpy GMT hand). Both 39.5mm and around 14mm thick.
That’s the SBGW231, with a strap swap. It’s a bit of an outlier for Grand Seiko in that it’s manual wind, no date, 37mm in diameter and a sensible thickness (11.6mm).
There are auto (with date) and GMT variants, kind of. They’re larger, as you might expect. Look at the SBGJ217 (hi-beat) and SBGM221 (auto, also weird stumpy GMT hand). Both 39.5mm and around 14mm thick.