I think this is a Clipper of some kind, and these pics don't do it justice, it is a good looking watch. I don't think it has ever been serviced, there is no indication that anyone has ever opened the case, in fact, it was a bit of a pain to get it open due to age and corrosion. There isn't a mark on the movt anywhere to suggest it has ever been touched, a bit concerning, considering it appears to be well worn.
Bracelet as recieved is a half expansion JB Champion that looks like it might be original?
It will get the full CTR and polish, and I should mention that the bezel does not have any texture like on some clippers of the same period. It is simply a polished stainless case.
It is difficult to make out in the pic, but the dial says 'Automatic'.