Accumatic A-516
1972 · Stainless
About the Accumatic A-516
Made only in 1972, the Accumatic A-516 is a round stainless steel automatic with a blue dial, running on Hamilton's caliber 689. It's part of the Accumatic family, Hamilton's long-running line of self-winding watches that spans the 1950s through the early 1970s. The hidden lug design gives the case a cleaner, more modern profile than earlier Accumatic references, and the blue dial with applied indices made it one of the more visually polished entries in the line that year.
Blue dials on vintage Hamiltons from this era are prone to fading or developing uneven color if they've been exposed to moisture or UV light over the decades, so dial condition is worth scrutinizing closely. Finding a clean example with original lume and no cloudiness in the crystal is genuinely satisfying, and the stainless steel case tends to hold up well to light polishing or careful cleaning without losing its shape.
From the Catalog
Hamilton offered the A-516 with a blue dial in two configurations in 1972, either on a strap at $105.00 or on a bracelet at $110.00, reflecting the modest premium for the integrated bracelet option.
Hamilton Catalog Images
1972
1973
1974
What to Look For
| Dial | Blue dials can fade, spot, or shift in hue unevenly with age. Look across the dial at an angle in good light for any moisture damage, bubbling, or discoloration near the edges. The applied indices should be flat against the dial without separation or tilting. Note that if the dial has any printing, it cannot be cleaned without risking loss of those markings. |
| Crystal | Check for deep scratches, crazing, or cloudiness that could indicate moisture has gotten in at some point. A hazy crystal on a blue dial watch will make the color look muddy, so clarity matters here both practically and aesthetically. |
| Movement | Dried oil in the caliber 689 creates enough friction to stop the watch even when it appears to wind and set normally. A watch that hasn't been serviced in years should be treated as due for a full service regardless of whether it's running. |
| Case | Hidden lug cases can make case back removal trickier than expected. Inspect the case back edge for tool marks from prior openings, which can indicate a rough service history. The stainless steel case should show no deep gouges or evidence of heavy polishing that's softened the lines around the lugs. |
| Crown | Even though the A-516 was rated water resistant when new, vintage water resistance ratings should not be trusted without fresh gaskets and pressure testing. Check that the crown screws or seats properly and shows no corrosion at its base, which can signal past moisture exposure. |
The Movement
The caliber 689 is a Swiss-made automatic movement that Hamilton used through the early 1970s, winding via a bidirectional rotor and offering a solid, if compact, power reserve. It's a reliable workhorse, but like all movements of its age, it benefits from fresh oil and a thorough cleaning to run at its best. Reassembly requires careful alignment of several gear train components simultaneously, so finding a watchmaker familiar with this caliber is worth the effort.