as these questions come up quite often & the information supplied in various posts tends to "drown", here are the dimensions for these model references.
note that the cases of the 7650 Co-Pilots, the post-1969 1765 Unitimes (and the re-marked TT versions) & the 7656 Co-Pilot Top Time are not larger than the earlier models, just the bezels are quite a bit wider - but the lugs are more massive and the cases quite a lot higher, so "wear larger".
Dimensions are approximate and vary slightly between production batches or single pieces.
ref. 765 AVI; early black dial versions, beaded bezel
I do not own an example of the later production batches, these might be slightly different
40.10 Watch Diameter
41.10 Bezel Diameter
10.90 Height at Bezel
13.20 Height w/ Crystal
ref. 765 AVI; 60s reverse panda versions, coin edge bezel
39.80 Watch Diameter
41.00 Bezel Diameter
10.60 Height at Bezel
12.80 Height w/ Crystal
ref. 765 CP; reverse panda, coin edge bezel
ref. 765 CP Yachting; reverse panda, coin edge
early (and rare) ref. 1765 Unitime; reverse panda, coin edge
40.00 Watch Diameter
41.00 Bezel Diameter
10.90 Height at Bezel
13.70 Height w/ Crystal
ref. 7650 Co-Pilot; reverse panda, coin edge bezel
ref. 7650 Yachting; reverse panda, coin edge bezel
ref. 1765 Unitime; reverse panda, coin edge bezel
ref. 7656 Co-Pilot Top Time; reverse panda, coin edge
40.10 Watch Diameter
42.80 Bezel Diameter
12.60 Height at Bezel
15.40 Height w/ Crystal
side view, showing the "massive" post-1969 cases on the bottom.
and some watches
