anon438
429
No, not the lugs make the ref
It is the case design, two different layouts, easy to recognise by the pushers:
ref 4240 - pushers down side, cause openings in the snap back for pushers
ref 4241 - pushers up side, no openings in the snap back
If you open the watch you will recognise it easily.
This would apply for the Gold versions. Steel maybe different design, would need to be compared.