Sea Haven III
1972–1973 · Stainless Steel · Stemwound
About the Sea Haven III
Made from 1972 through 1973, the Sea Haven III is a water-resistant stainless steel sports watch from Hamilton's early 1970s lineup. It pairs a blue dial with hooded lugs, giving it a distinctly nautical character that fits its name. The Sea Haven III sits within a small cluster of water-resistant Hamilton models from this period that leaned into sport and outdoor utility rather than dress watch formality.
Finding one with the original blue dial intact is the real challenge here. Blue dials from this era can fade, spot, or develop uneven color from moisture intrusion over the decades, so condition varies considerably. The hooded lug design is a period-specific detail that collectors tend to either love immediately or overlook entirely, but it gives the Sea Haven III a look that reads as very much of its moment.
From the Catalog
Hamilton offered the Sea Haven III as a strap model at $67.50 or on a bracelet at $75.00, with water resistance called out as part of its appeal. The catalog kept the description simple: stainless steel, blue dial, built for wear.
Hamilton Catalog Images
1972
1973
What to Look For
| Dial | Blue dials from this era are prone to fading and spotting. Look closely for moisture damage, uneven color, or blistering near the edges. Any significant dial damage is hard to undo without a replacement, which changes the watch's originality. |
| Crystal | Check for deep scratches or crazing. A worn crystal can be replaced, but it's worth factoring into your assessment of overall condition. |
| Movement | Wind the watch and confirm it's running. On a movement this age, dried lubricants can build up enough friction to stop it or cause erratic timekeeping. A watch that's been sitting unserviced for years may run initially and then stop within hours. |
| Case | Examine the hooded lugs carefully. That design can trap grime and is sometimes affected by uneven wear or dings that are harder to spot at a glance. Also note that case backs on water-resistant models from this period can be stubborn to open without the right tools, so evidence of prying damage is worth flagging. |
| Crown | Check that the crown screws down or seats firmly, depending on the design. Also confirm there's no wobble or looseness, which can indicate a worn stem or crown tube. |
The Movement
The caliber 685 is a Swiss manual wind movement used across several Hamilton models, including military-style field watches and sport-oriented cases. The jewel count for this caliber is not confirmed in the available records, so no figure is given here. It winds entirely by hand at the crown, with no automatic rotor, which keeps the movement slim and straightforward to service. Hamilton deployed the caliber 685 in a range of utilitarian contexts, pairing it with stainless steel cases built for durability rather than dress. The manual winding requirement means the wearer interacts with the watch directly, winding it at regular intervals to keep the mainspring loaded. For a movement of this type, a consistent winding routine, ideally daily, is the best way to maintain steady timekeeping. Like any vintage manual wind caliber that has been sitting unused, it benefits from a full service before regular wear, since decades-old lubricants break down and can impede even a mechanically sound movement.