Aqualine
1957–1960 · 10k Yellow Gold Filled / Stainless Steel · Manual Wind
About the Aqualine
Made from 1957 through 1960, the Aqualine pairs Hamilton's caliber 730 manual wind movement with a 10K yellow Gold Filled case and stainless steel back. The dial is silver with applied gold numerals and markers and luminous dots, and Hamilton marketed it as waterproof at its original release. It's a clean, sport-adjacent dress watch from the late 1950s, sitting in that sweet spot where utility and everyday elegance converge without much fuss.
The silver dial is the thing to scrutinize on any example you come across. The original finish is prone to peeling or fading if it's ever been exposed to moisture or well-meaning but misguided cleaning attempts, so look carefully at the surface under good light before committing. The applied gold numerals and markers hold up better than the background itself, which means you can find examples where the indices look sharp but the dial underneath tells a different story.
From the Catalog
Hamilton listed the Aqualine in 1957 as a 17-jewel, 10K yellow gold-filled watch with 14K gold numerals and markers, luminous dots, and a stainless steel back, advertised as waterproof. It was offered on a strap for $79.50 or on a bracelet for $89.50.
Hamilton Catalog Images
1957
1958
1959
1960
What to Look For
| Dial | Examine the silver dial closely under direct light. The original finish can begin peeling or develop haze if the watch has ever seen moisture, and that damage is irreversible. The applied gold numerals and markers often survive better than the dial surface itself, so do not let crisp indices distract from a compromised background. |
| Crystal | Check for chips, deep scratches, or crazing. A worn acrylic crystal is replaceable, but confirm the fit is correct for the case before buying a replacement. |
| Movement | The caliber 730 is a capable American-made manual wind, but dried oil is a genuine concern on any example that hasn't been serviced in years. Even modest friction from dried lubricants can stop the movement entirely, so confirm the watch actually runs and holds time before assuming it's healthy. |
| Case | Look at the gold-filled surfaces on the case for wear-through to the base metal, particularly on the lugs and high-contact areas. Some wear is expected after sixty-plus years, but heavy wear-through affects both appearance and long-term durability. |
| Crown | Test the crown through winding and hand-setting. Stiffness or slipping can point to a worn stem or a movement that needs attention. Also note: despite Hamilton's original waterproof claim, no vintage watch with its original gaskets should be trusted near water today. |
The Movement
The caliber 730 is a 17-jewel manual wind movement made by Hamilton in the United States. It winds from the crown, requires daily winding to keep accurate time, and is a straightforward, well-regarded movement that responds well to a proper service. American-made Hamilton movements from this era have a good reputation for longevity when they're kept clean and lubricated.