Thinline 2020
1966–1970 · 14k Solid Yellow Gold · Manual Wind
About the Thinline 2020
The Thinline 2020 was produced from 1966 through 1970 in a 14K yellow gold rectangular case, powered by Hamilton's caliber 680 manual wind movement with 17 jewels. It belongs to Hamilton's Thinline family, which was built around the idea of elegantly slimmed-down case profiles suited to dress wear. The dial is silver with applied gold stick markers and no numerals, keeping the look clean and uncluttered in the way that defined the family's aesthetic direction.
Applied gold markers on a silver dial can show wear around the feet where the markers meet the dial surface, so close inspection under good light is worthwhile. The all-gold construction means case condition matters a lot here, since yellow gold scratches relatively easily and many examples will show wear commensurate with their age. Finding one with a dial that hasn't been refinished and a case that retains its original finishing is the real goal.
From the Catalog
Hamilton marketed the Thinline 2020 at $160, promoting its ultra-thin case design alongside practical credentials including shock resistance, anti-magnetic properties, an unbreakable mainspring, and waterproof and dustproof seals. The catalog entry kept it simple: 14K yellow gold, rectangular, and priced at the higher end of Hamilton's dress watch range.
Hamilton Catalog Images
1968
What to Look For
| Dial | Look carefully at the applied gold stick markers. They should sit flush and even, with no separation, gaps around the bases, or corrosion where the feet contact the dial. A refinished dial will often look too uniform or too bright, and marker placement may be slightly off from the original. |
| Crystal | Check for deep scratches or crazing. Replacement crystals are available, but confirm the fit is correct for the rectangular case, with no gaps or separation at the edges. |
| Movement | Lubricants in a movement this age dry out completely, and dried oil creates enough friction to stop the caliber 680 or cause it to run erratically. Ask whether the movement has been serviced recently, and factor in a service if the answer is unclear. |
| Case | 14K yellow gold is softer than steel, so expect scratches and edge wear on most examples. Look at the lugs specifically, since heavy polishing over the years can round off the original profile. A lightly worn case with honest scratches is preferable to one that has been aggressively buffed. |
| Crown | Make sure the crown engages cleanly and the stem doesn't feel loose or wobbly. Also note that even though the original spec included waterproofing claims, vintage seals should not be trusted for any water exposure. |
The Movement
The caliber 680 is a Swiss-made manual wind movement that Hamilton used across several of its dress-oriented Thinline models during this period. At 17 jewels, it is a competent and reliable movement that winds and sets predictably when in good condition. It is not complicated to service, but like any movement of this age, it needs clean lubricants to run well.