Sea Date
1973โ1976 ยท Stainless
About the Sea Date
Made from 1973 through 1976, the Sea Date is a stainless steel sports-oriented Hamilton running the caliber 671 automatic. It was part of Hamilton's broader push into date-display watches during the early 1970s, a period when date complications were becoming expected rather than exceptional in this price range. The case runs 12mm thick, which gives it a substantial feel on the wrist without tipping into the oversized territory some competitors were chasing at the time. Water resistance was part of the original specification, which fit the "Sea" branding and the market Hamilton was targeting.
Finding a Sea Date in honest condition takes some patience. The gray dial is the version to know from the original catalog listings, and the applied indices are worth inspecting closely since any separation or loss there changes the character of the watch significantly. The hidden lug design is a nice detail that keeps the profile clean, and it tends to hold up well when the watch hasn't been over-polished.
From the Catalog
Hamilton listed the Sea Date at $89.95 in its 1972 catalog with a gray dial in stainless steel, positioning it as an accessible entry into the date-display automatic category at a time when that feature still carried some real appeal.
Hamilton Catalog Images
1972
1973
1975
1976
What to Look For
| Dial | Look closely at the applied indices. Any that are separating, missing, or showing corrosion underneath will affect both the look and the value. The gray dial surface should be consistent in color with no fading patches or moisture damage under the crystal. |
| Crystal | The Sea Date uses a special crystal that accepts a reflector ring. Confirm the ring is present and seated correctly. A replacement crystal that omits the reflector ring will look noticeably off and is a detail that matters to collectors. |
| Movement | The caliber 671 should be running and holding time. Dried oil is a real concern in any automatic that has been sitting unworn, and it can create enough friction to stop the watch or cause it to run erratically. A watch that starts with a wind but stops under normal wear is a strong signal that service is overdue. |
| Case | Check for over-polishing on the case and lugs. The hidden lug design has crisp lines when unmolested, and those lines round off quickly if someone has been aggressive with a polishing wheel. The case back can be tricky to open on these, so verify there are no tool marks from forced entry attempts. |
| Crown | Work the crown through its positions slowly. The set lever screw on the caliber 671 has a known tendency to come loose over time, and if it does, the stem can pull free during time setting. If the crown feels uncertain or comes out too easily, that screw should be checked before anything else. Also note that even though this watch was originally rated water resistant, vintage gaskets should not be trusted for water exposure. |
The Movement
The caliber 671 is a Swiss-made automatic with a date complication. It winds through a rotor that spins with the motion of the wrist and transfers energy to a conventional mainspring, so the watch keeps itself running under regular wear without manual winding. The gear train can be finicky to align during servicing, which means a competent service is worth confirming before buying if the watch hasn't been looked at recently.