Good day everybody I took the watch to be serviced and besides what the guy told me which is not very encouraging, I could see it open (i was not able to open it myself as it was so hard and did not want to make a mess using too much force) and here is the pic with the ref numbers of the case and of the movement, enjoy!!
The movement is in remarkable condition. Also, note the early, attractive, and rather sophisticated adjuster!
he said it will be hard as no spare parts available and that most of the mechanism are a so worn out, he'll be anyway working on it and do the best he can, anyway the expense forecast is under control so far…...
it doesn’t look worn out from your pic and spare parts shouldn’t be hard to find on eBay. I’m fairly certain the cal 12 series parts can be swapped except for the bridges which can be different