Accumatic A-605
1965–1970 · 10k Rolled Gold Plate · Automatic
About the Accumatic A-605
The Accumatic A-605 ran from 1965 through 1970, placing it in the middle of Hamilton's long-running Accumatic line of automatic dress watches. It rides on the caliber 689, a 17-jewel automatic movement, housed in a 10K yellow Gold Filled round case. The dial is white with applied gold markers and a sweep seconds hand, giving it a clean, uncluttered look typical of mid-1960s American dress watch design. The A-605 is one of several round Accumatic models from this period, distinguished from its siblings mainly by dial configuration and case finishing.
Surviving examples tend to show up with dials in reasonable shape, though the white finish can develop a warm patina or show faint spotting near the edges where moisture found its way in over the decades. The known dial variant, a radial-finished white dial with golden rectangular markers, is worth keeping an eye out for, as it has a noticeably different character from the standard silver-tone baton-marker version Hamilton described in the 1965 catalog.
From the Catalog
Hamilton described the A-605 in 1965 with a silver dial and applied baton markers, positioning it as a clean, professional automatic at a retail price of $79.50, a mid-tier offering in the Accumatic range for that year.
Hamilton Catalog Images
1968
What to Look For
| Dial | Look closely at the white dial surface for spotting, separation near the edges, or discoloration around the markers. The applied gold markers themselves should sit flat and show no signs of detachment or corrosion underneath. Any moisture intrusion usually shows up at the perimeter first. |
| Crystal | These shipped with acrylic crystals. Deep scratches can be polished out, but check for cracks at the edge where the crystal meets the bezel, that area takes the most abuse and cracks there are not always obvious at first glance. |
| Movement | Dried lubricants are a real concern on any watch pushing 55 to 60 years old. Even a small amount of friction buildup in the gear train can cause the watch to stop, run erratically, or lose significant time. A watch that only runs well after being shaken is telling you the oils have given out and a service is overdue. |
| Case | The 10K yellow RGP case can show wear-through on high-contact points, lugs, caseback edges, and the bezel rim. Light wear is expected and honest. Heavy wear-through that exposes the base metal significantly affects both appearance and value. Check the caseback for dents or evidence of improper opening attempts. |
| Crown | The crown should pull out cleanly to the setting position and push back in with a positive stop. A wobbly or sticky crown often points to a worn or damaged stem, and on single-piece cases like this one, stem removal carries some risk during servicing, worth factoring in if the crown feels off. |
The Movement
The caliber 689 is a 17-jewel automatic built by Hamilton for its Accumatic line. It winds through a bidirectional rotor, meaning normal wrist movement keeps the mainspring charged without any manual winding needed during regular wear. It's a straightforward, robust movement for its era, not flashy mechanically but well-suited to the dress watch role it was designed for.