Seabrook
1957–1960 · 10k Rolled Gold Plate / Stainless Steel · Manual Wind
About the Seabrook
Made from 1957 through 1960, the Seabrook pairs Hamilton's caliber 671 manual wind movement with a 10K yellow rolled gold case and stainless steel back. The dial is one of its most distinctive features: an embossed surface with a textured pattern of small ridges, luminous numerals at 3, 6, 9, and 12, and a sweep seconds hand. The Seabrook is closely related to the Accumatic III, sharing the same case and dial design but running a manual wind movement instead of an automatic.
That embossed dial is the first thing to scrutinize on any Seabrook. The raised ridged pattern is visually striking when it's right, but it shows wear and oxidation differently than a flat dial, and a piece that's been exposed to moisture can show subtle discoloration in the texture that's hard to reverse. The rolled gold case holds up well in general, but check the lugs and high-contact areas for wear through to the base metal.
From the Catalog
Hamilton marketed the Seabrook in 1957 as a waterproof, shock-resistant model with an embossed luminous dial and sweep seconds, available with a bracelet at $59.50. That price put it in the mid-range of Hamilton's sport and dress lineup for the year, reflecting the rolled gold case and the added value of the waterproof designation.
Hamilton Catalog Images
1957
1958
1959
1960
What to Look For
| Dial | Look closely at the embossed surface. The textured ridge pattern can trap moisture and oxidize unevenly, so look for discoloration or darkening between the ridges. Luminous material on vintage dials should be consistent in color across all markers, patchy or flaking lume is common and worth noting before purchase. |
| Crystal | The Seabrook takes a specific crystal that accepts a reflector ring. Make sure what's on the watch is correct for the case, a generic replacement may not seat properly and can affect how the dial looks under the crystal. |
| Movement | Lubricants in the caliber 671 dry out over decades, and a movement running on spent oil is wearing itself down with every tick. Ask whether the watch has been recently serviced, and if the answer is vague, budget for a full service before regular wear. |
| Case | The 10K yellow rolled gold over stainless steel wears through over time, especially on the lugs and caseback edges. Check those spots for color shift or silvery base metal showing through. The stainless backs on these can be tricky to open without the right tools, so watch for evidence of prying damage around the caseback lip. |
| Crown | Test the crown carefully through all positions. The caliber 671 has a known tendency for the set lever screw to work loose over time, which can cause the stem to pull out unexpectedly during time setting. A watchmaker can address this during service, but it's worth knowing before you buy. |
The Movement
The caliber 671 is a 17-jewel manual wind movement that Hamilton used across a range of dress and sport models in this period. It winds smoothly, keeps reliable time when properly serviced, and is a known quantity for any watchmaker familiar with American-era Hamiltons. The sweep seconds hand runs off the center wheel, giving the dial a clean look without a separate subseconds register.