Sea-Glo
1958–1961 · Stainless Steel · Manual Wind
About the Sea-Glo
Made from 1958 through 1961, the Sea-Glo is a stainless steel sport watch built around Hamilton's caliber 671, a 17-jewel manual wind movement. The name and the design point clearly at the water: a waterproof rating from the factory, a sweep seconds hand, and an embossed luminous dial that was meant to be read in low light or wet conditions. It came in two dial versions, white and black, and was offered either on a bracelet or a strap, which was a practical choice for a watch pitched as a serious everyday tool.
Surviving examples show their age in predictable places: crystal scratches, bracelet wear if the original bracelet is still present, and the occasional fading or chipping of the luminous compound on the dial. The embossed dial construction is worth appreciating up close. The numerals and markers have a three-dimensional quality that catches light differently than printed dials, and it gives the watch a durability of character that holds up well even when the case shows honest wear.
From the Catalog
Hamilton's 1958 catalog described the Sea-Glo as a stainless steel watch with an embossed luminous dial, sweep seconds, and a waterproof rating, also available with a black dial. It retailed at $55.00 on bracelet and $49.50 on strap, pricing that reflected its position as a capable, unpretentious tool watch.
Hamilton Catalog Images
1958
1959
1960
1961
What to Look For
| Dial | Check the embossed numerals and markers carefully. The three-dimensional construction is part of what makes this dial distinctive, but the raised surfaces can accumulate grime in the recesses or show chips at the edges if the watch was handled roughly. Confirm which variant you have: the white dial and black dial are both correct for this model, but they read very differently in person. |
| Crystal | The Sea-Glo uses a crystal that accepts a reflector ring, which is specific to this case. If the crystal has been replaced, confirm it was done with the correct part. A misfit crystal or missing ring affects both the look and the seal. |
| Movement | The caliber 671 is a dependable movement, but lubricants dry out over decades. Dried oil creates friction that can slow the movement or stop it entirely, and a watch that runs intermittently is telling you it needs service. Ask about service history before buying. |
| Case | Stainless steel holds up well, but the case back on these can be tricky to open without the right tools, and improper attempts leave marks. Look at the case back edge for evidence of slippage. A clean edge usually means the watch has been serviced correctly or not opened by someone improvising. |
| Crown | The waterproof rating this watch carried at retail depended entirely on gaskets that are now decades old. Treat this as a water-susceptible watch regardless of its original spec, and inspect the crown for smooth winding action with no slippage or wobble. |
The Movement
The caliber 671 is a Swiss-made manual wind movement running at 17 jewels. It winds from the crown, keeps time with a sweep seconds hand rather than a ticking subseconds dial, and is straightforward to service when a watchmaker has the right parts. The gear train can be finicky to align during reassembly, so it rewards a careful hand, but there is nothing exotic or fragile about it as a design.