That is chunky, when compared to the BB58, hmm was looking at GMTs yesterday to complete the 3 watch collection but they does seem higher than I remember but then my Hanhart is 13mm
All the Tudor GMTs are very thick because the Kenissi-developed movement they’re using is a real chunky boi. Even the Seiko 5 GMT is over a mm thinner.
They’re the best part of 15mm thick (and very slab sided). Which isn’t great for a 39mm watch.