I agree with abrod, the diameters are the same as far as I know but yes, there are very small variations on depth.
Always difficult to take comparison shots but here is one-this is a 9220 (left) and a 73343 (right) which has the same dimensions as the 7743 I believe-
View attachment 1071782
As you can see they are extremely similar, as they are in look and feel when wearing. The 3 register models are little more 'chunky' but still a negligible difference I'd say.
There happens to be a nice honest example that has just come up for sale from a well-known collector-
http://www.chronocentric.com/forums/chronotrader/index.cgi?page=1;md=read;id=121592
Best, Steve
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