Looks like a 106-50-6. Look under the balance wheel. Often the number there
Look at the pics from their parts catalog. Numbers 310/2 and 357 were part of the 106 series
I see you have this watch listed for sale on eBay
I see you have this watch listed for sale on eBay
Kind of you to help with the OP's sales listing, even taking the time to scan parts lists. 馃榿
In fairness I've not used any of the info offered by @CaptainWinsor in the sales listing.
Kind of you to help with the OP's sales listing, even taking the time to scan parts lists. 馃榿