Thinline 6507
1968–1969 · 10k RGP / Stainless · Manual Wind
About the Thinline 6507
Made from 1968 through 1969, the Thinline 6507 is a manual-wind dress watch from Hamilton's Thinline family, which drew on Hamilton's push toward slimmer, more refined case profiles during the late 1960s. The 6507 runs the caliber 639, a 17-jewel manual-wind movement, and comes in a 10K yellow RGP top with stainless steel back. The round white dial carries applied gold numerals at all positions with a subseconds register at 6 o'clock.
Applied gold numerals age differently than printed ones, and on a watch this old it is worth checking each one closely. They can pull away from the dial at the edges or develop slight patina around their bases, both of which tell you something about how the watch was stored and whether it was worn regularly. Finding a 6507 with the dial in genuinely clean condition takes some patience.
From the Catalog
Hamilton listed the 6507 in 1968 at $59.50 for the watch on its own, and also offered it as part of a bracelet configuration at $69.50, describing it simply as a 10K yellow RGP model with stainless steel back.
Hamilton Catalog Images
1968
What to Look For
| Dial | Check each applied gold numeral carefully. They can come loose or separate with age, especially near the 6 and 12 positions where moisture tends to collect. Also look for any hairlines, spotting, or staining on the white dial surface, which does not clean up and directly affects value. |
| Crystal | The original crystal is acrylic. Minor scratches can usually be polished out, but deep gouges or crazing mean replacement. Make sure the crystal sits flush and sealed in the bezel with no gaps. |
| Movement | The caliber 639 has very little clearance between its overlapping parts, and oil in a movement this age has almost certainly dried out enough to create real friction. Ask whether the watch has been serviced recently. A movement that runs briefly and then stops is a telltale sign of dried lubrication, not a worn-out caliber. |
| Case | The 10K yellow RGP top layer can wear through to the base metal on high-contact points, particularly the lugs and bezel edge. Look closely at those areas in good light. The case back is stainless steel and can be stubborn to open without the right tools, so check for tool marks around the edge. |
| Crown | The crown on a manual-wind movement like this takes more regular use than an automatic. Check that it winds smoothly without slipping or grinding, and that it snaps back properly into the running position after setting. |
The Movement
The caliber 639 is a 17-jewel manual-wind movement that Hamilton used across several of its dress-oriented models in the late 1960s. It winds and sets cleanly when everything is in good shape, but the movement has very little clearance between its overlapping parts, which means dried oil becomes a real problem over time. At this age, a full service is almost always necessary before the watch runs reliably.