So, your movement is not the 27CH (which is just a size (in mm approx) and the fact that it is a CHronograph). Yours has a 12 hr register, so would be a 27 CH12.
But, I believe yours is the next step, the 2310. Your best bet for spares is to find the Omega and Tissot calibre equivalents, and the part numbers from the exploded diagrams available online (there are many).
Good luck
D
If it's Lemania-powered, I'm interested. Tool Chrono - interested. Dive Chrono - interested. Interesting - interested
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