1968 Hamilton Thin-O-Matic Wristwatch (Working)

Here, we have a beautiful, vintage Hamilton FMC Thin-O-Matic wristwatch. The watch case is marked on the back: 10K GOLD - HAMILTON - B. Whitaker - 41 YEARS SERVICE - 1968. The front of the watch reads as follows: HAMILTON - FMC - THIN-O-MATIC. The watch DOES run and keeps time well. Please look at pictures or ask questions, and I will answer to the best of my ability as I am certainly not an expert. The watch would make a fantastic addition to a collection.