A curious 4 digit (8147) apparently factory engraved or roll marked number also appears on the case back adding a bit of added mystery to this excellent example
It comes with Hamilton's 19 Jewel 754 movement
showing some light brassing
This copy actually came straight from the author
It designed to be worn on the side of the wrist
Hamilton Thinline 6504 Watch MOVEMENT_Quartz A curious 4 digit (8147)Offered is this FULLY SERVICED circa 1968 Hamilton Thinline 6504 watch that winds, sets, and runs great. The watch keeps excellent time. It has a very nice tonneau shape. BRAND: Hamilton GENDER: Mens CASE: Stainless Steel Back with 10K RGP Bezel CASE BACK: Marked 10K RGP Bezel, Stainless Steel Back, Hamilton, and inside marked Hamilton W. Co., Lancaster, PA., 10K. RGP Bezel, Stainless Steel Back, P220883, Star W. C. Co., 917668 BAND BRACELET: Brand