Hi, recently saw this LeCoultre Valjoux 72 from the 60s, and wondering whether it's the real deal. How could I go about finding out the real production year / model number? https://abload.de/img/20180907-8b1a5970r3ihu.jpg https://abload.de/img/20180907-8b1a5965gqd95.jpg https://abload.de/img/2018090...