A nice Cartier Tank vintage from ca. 1970's gold electroplated with the emblematic "chiffres romains et minuterie chemin de fer" 🚂. The movement is a Cartier Caliber 78-1 based on a ETA 2512 with 17 jewels. I sold this watch a few years ago, so it's not anymore in my current collection.
Info about the specs of the ETA Cal. 2512; here.
If you want to read more about the history of Cartier; here.