Thin-o-matic T-575
1960–1962 · Stainless · Automatic
About the Thin-o-matic T-575
The Thin-o-matic T-575 appeared in a single catalog year, 1961, as part of Hamilton's Thin-o-matic family, which was built around the goal of producing slim, elegant automatic watches in American-made stainless steel cases. It runs on the caliber 668, a 17-jewel automatic movement, and wears a round stainless steel case with swept lugs. The dial is two-toned silver with Arabic numerals and a sweep seconds hand, giving it a clean, understated read.
Finding one in honest shape means looking closely at that two-toned silver dial, since any moisture intrusion or aging tends to show up as uneven patina or color shift at the boundary between the two tones. The round case with swept lugs holds up well in stainless, but single-year production means examples don't surface constantly, so condition matters more than usual when one does appear.
From the Catalog
Hamilton described the Thin-o-matic line as a refined answer to the demand for a slim automatic dress watch, and the T-575 fit that positioning with its polished stainless case and clean two-toned dial.
Hamilton Catalog Images
1960
1961
What to Look For
| Dial | The two-toned silver finish is the first thing to scrutinize. Look for discoloration, spotting, or any blurring at the boundary between the two tones. These are signs of past moisture or improper storage and are difficult to undo. |
| Crystal | Check for deep scratches or crazing. A heavily scratched crystal can often be replaced, but confirm the replacement fits the case profile correctly before committing. |
| Movement | Ask when the caliber 668 was last serviced. Oil in a movement this age dries out, and dried lubricant creates enough friction to stop the watch or cause it to run poorly even when it seems to be working. A movement that winds and runs is not necessarily a serviced one. |
| Case | Inspect the case back and lugs for tool marks or wear at the edges. Case backs on vintage Hamiltons can be tight and are sometimes forced open carelessly. Heavy marks are a sign of rough handling. |
| Crown | Check that the crown seats fully and that the watch winds and sets smoothly. A crown that feels loose or gritty often points to a worn or damaged stem, which requires a service visit to address properly. |
The Movement
The caliber 668 is a 17-jewel automatic movement made by Hamilton in the United States. It winds via a bidirectional rotor, so normal wear keeps it running without manual winding under typical daily use. It's a reliable, well-regarded caliber from this period, though like any movement of its age it benefits significantly from a fresh service.