Here is an interesting one. Dated inside and out as 1953 with a smooth crystal.. If it was dated 1952 with said crystal, it would be a Sky King. Dated 1953 with a beveled crystal, it is a Pelham. I have to believe this is a cross-over and a
1953 Sky King
For reference, discussions here
Based on consensus, I am comfortable with either ID as both appear to be pretty uncommon, but as previously determined, crystal appears to be the deciding factor.
We do not have good linebook info on the early 1950's era so we cannot be sure of exact years. I thought the best thing is to check is the 1953 and 1954 price sheets we have on the catalog page. In the 1953 Price Sheet it has Pelham but no Sky King. In the 1954 price book it has no Pelham but Sky King. It should be noted they both have the same model number #31733 which is conclusive in my opinion. Therefore, I believe all 1952-1953 models should be called Bulova Pelham and 1954 is Sky King regardless of crystal type.
In reply to Bob - which line book did… by Geoff Baker
In reply to If Pelham appears in 1953… by Geoff Baker
It may be that the scanned image from the linebooks is distorted, but when comparing the 2, there is a difference in width. Again this just might be a distortion.
Top watch with the beveled crystal is the Pelham and the bottom the Sky King with the flat crystal.
2 different watches?

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