Dateline T-477
1964–1967 · 10k Yellow Gold Filled · Automatic
About the Dateline T-477
Made from 1964 through 1967, the Dateline T-477 is part of Hamilton's Thinline automatic family, specifically the date-equipped Dateline sub-group. It runs on the caliber 624, a 17-jewel automatic, housed in a 10K yellow Gold Filled round case. The dial carries applied gold numerals at 6, 9, and 12 o'clock with applied gold markers filling the remaining positions, all on a silver background with a sweep seconds hand and date display.
Applied gold indices can oxidize or separate from the dial over decades, so close inspection of the dial under good light is worth the time before buying. The silver dial finish on these can develop a pleasant patina, but any detachment or missing markers changes the character of the watch considerably. The combination of sweep seconds and date on a slim automatic case made this a capable everyday watch when new, and that versatility still reads clearly today.
From the Catalog
Hamilton listed the T-477 at $100 in 1964, describing it simply as a calendar watch in a 10K yellow gold-filled case, which was a practical entry point for an automatic with date in the Thinline line.
Hamilton Catalog Images
1964
1965
1966
What to Look For
| Dial | Look carefully at each applied gold numeral and marker. Any that are separating, shifted, or missing will be costly to address properly. Check for spotting or discoloration in the silver finish around the date window, which can indicate past moisture intrusion. |
| Crystal | These came with acrylic crystals. Deep scratches can be polished out, but check for crazing or chips at the edges, which sometimes signal an impact the movement absorbed too. |
| Movement | The caliber 624 is automatic, so it should wind from wrist motion. If the watch stops frequently or runs poorly, dried lubricants are the most likely cause on any movement this age. The calendar mechanism includes small springs that are easy to lose during disassembly, so a competent service history matters here. |
| Case | On 10K gold-filled cases, wear through to the base metal shows first on the caseback, lugs, and crown-side edges. Inspect those areas under light. Straight lugs on these cases can show polishing damage if someone has been heavy-handed over the years. |
| Crown | The crown should feel positive when pulled to the date-set position and wind smoothly when pushed in. Any mushiness or grinding in the winding action is a reason to factor a service into the price. |
The Movement
The caliber 624 is a 17-jewel automatic movement produced by Hamilton during the mid-1960s as part of its Thinline platform. It winds from the motion of the wearer's wrist through a bidirectional rotor, and includes a date complication driven off the movement's gear train. It is a reliable movement when properly serviced, though the calendar components require care during a teardown.