Thinline 2023
1966–1970 · 14k Solid Yellow Gold · Manual Wind
About the Thinline 2023
Made from 1966 through 1970, the Thinline 2023 is part of Hamilton's Thinline family, a line built around slender case profiles and clean, dressed-up aesthetics. The case is 14K yellow gold with a rectangular shape and an oval dial, a combination that gives the watch a softened, almost art deco character unusual for its era. Power comes from the caliber 680, a 17-jewel manual wind movement well suited to the slim case architecture. At $175 in 1966, this was a serious purchase, positioned firmly in Hamilton's upper tier.
The oval silver dial with applied gold baton hour markers is one of the more distinctive details on this model, and condition there matters more than almost anywhere else. Look closely at the dial surface for spotting, separation at the markers, or discoloration near the edges, all of which are common after five or six decades and affect value significantly. Finding one in genuinely good dial condition, with the gold case still holding its finish rather than worn through at the lugs, is less straightforward than it might seem.
From the Catalog
Hamilton described the 2023 as an ultra-thin design with a shock-resistant, anti-magnetic, manual wind movement and an unbreakable mainspring, marketed as waterproof and dustproof with seals intact. It carried an original retail price of $175 in 1966, which reflects its positioning as one of the more premium offerings in that year's lineup.
Hamilton Catalog Images
1966
1968
1971
What to Look For
| Dial | The silver dial should be clean and even. Look for spotting, edge discoloration, or any applied gold baton markers that have separated or shifted. These details are expensive or impossible to fix correctly, so take your time here. |
| Crystal | Check for deep scratches or chips. A correct replacement crystal for an oval dial profile can be harder to source than on round models, so assess what is there before assuming a swap is simple. |
| Movement | Ask about service history. Lubricants in a movement this age dry out completely over decades, and a caliber 680 running on dried oil will develop enough friction to stop the watch or cause irregular timekeeping. A recent service by someone familiar with vintage Hamilton movements is worth a meaningful premium. |
| Case | 14K yellow gold wears differently than gold-filled, but it still shows at the lugs and high contact points. Check for deep wear or buffing damage, which can soften crisp edges and reduce both visual appeal and value. Hidden lugs in particular can trap debris or show uneven wear. |
| Crown | Make sure the crown winds smoothly and sets the hands without slipping. A worn or replaced crown on a gold case can be a cosmetic mismatch that is easy to overlook in photos. |
The Movement
The caliber 680 is a 17-jewel manual wind movement that Hamilton used across several of its dress watch lines during this period. It winds and sets cleanly, keeps reliable time when properly serviced, and its slim profile made it a natural fit for thin-case designs like the Thinline series. At this age, a full service including fresh lubricants and a timing check is the baseline expectation for a watch that is actually being worn.