Seamaster 30 1 dial 2 ref ??

Good morning, I have a small mystery to solve. I own a Seamaster 30 ref. 135.007-63 with a dial featuring Arabic numerals. Recently, I came across a listing for another Seamaster 30 with an identical dial to mine, but the caseback reference on that watch is 135.003-62. I would like to know if it is possible to find the same dial with two different references (strange), and if not, in your opinion, what is the correct reference for this dial? Could someone have fitted the “wrong” caseback? Thank you very much for your attention.

Hi, thank you very much for your reply! I wasn’t aware that the reference referred exclusively to the case. So, are there the main lines (Seamaster, Speedmaster, etc.) divided into models (Seamaster 300, 30, 600, 120, etc.) and for each model specific case types?

Hi, thank you very much for your reply! I wasn’t aware that the reference referred exclusively to the case. So, are there the main lines (Seamaster, Speedmaster, etc.) divided into models (Seamaster 300, 30, 600, 120, etc.) and for each model specific case types?