Accumatic A-660
1972 · 14k Solid Yellow Gold
About the Accumatic A-660
Made only in 1972, the Accumatic A-660 is one of the dressier entries in Hamilton's long-running Accumatic line, housed in a 14k solid yellow gold round case. It runs on the caliber 689A, a self-winding movement Hamilton used across a number of its automatic models during this period. The Accumatic family was Hamilton's primary line of automatic wristwatches through the 1960s and into the early 1970s, and the A-660 represents a late, more refined expression of that lineup.
Solid 14k gold cases from this era can show wear at the lugs and case edges, which is worth examining closely before buying. The swept lug profile and applied indices give this watch a clean, dressy character that holds up well even with modest case wear. Finding one with a dial in good condition matters quite a bit here, since any surface damage to the dial is difficult to address without affecting the original finish.
What to Look For
| Dial | Look closely at the dial surface for spotting, peeling, or discoloration around the indices. Applied indices can sometimes show separation or tarnishing at their edges. Any attempt to clean the dial risks damaging the lacquer and underlying printing, so condition at purchase is what you have to work with. |
| Crystal | Check for deep scratches or chips in the crystal. A fogged or heavily scratched crystal is replaceable, but it should be factored into your assessment of the watch overall. |
| Movement | Ask about service history. Dried oil creates enough friction to stop the 689A even when the watch appears to wind and set normally. If the rotor spins freely but the watch isn't running reliably, dried lubricants are the most likely cause and a full service is the right fix. |
| Case | Examine the case and lug edges for wear and any signs of over-polishing. On a 14k solid gold case, excessive polishing can round out the original case lines significantly. Case backs on watches from this period can be tight, so look for tool marks around the back if it has been opened improperly. |
| Crown | Test the crown through all its positions. It should pull out smoothly and set the hands without slipping. A sticky or loose crown often points to a worn or damaged stem that will need attention at service. |
The Movement
The caliber 689A is a self-winding movement with 17 jewels, wound by a rotating rotor as the watch moves on the wrist. It is a reliable everyday automatic from this period, though like all vintage movements it benefits from fresh lubrication on a regular service cycle. The 689A is a well-understood caliber among Hamilton specialists, and parts support remains reasonable.