Accumatic A-503
1963–1964 · Stainless Steel · Automatic
About the Accumatic A-503
Made from 1963 through 1964, the Accumatic A-503 runs on Hamilton's caliber 689 or 689A, a 17-jewel automatic movement housed in a stainless steel round case. The A-503 is part of the Accumatic family, Hamilton's line of automatic watches aimed at everyday wear with reliable self-winding performance. Its clean white dial carries embossed silver numerals and markers, with numerals at 6 and 12 and a sweep seconds hand giving the dial a spare, uncluttered look. Related models include the Accumatic VIII and the Accumatic VIII-B, which share the same general family DNA but differ in case and dial configuration.
Stainless steel cases from this era tend to hold up reasonably well, but the lug area and caseback edge are worth inspecting closely for pitting or deep scratches from prior cleaning attempts. The embossed silver numerals and markers are a detail that photographs well and tends to age gracefully, though the dial itself is susceptible to moisture damage around the edges. Finding one with an original bracelet intact is genuinely uncommon, since most survivors have long since been paired with a replacement strap.
From the Catalog
Hamilton offered the A-503 in 1963 with a stainless steel case and matching bracelet at $59.95, or on a strap for $55.00, positioning it as an accessible entry into the Accumatic automatic lineup.
Hamilton Catalog Images
1963
1964
What to Look For
| Dial | Look at the white dial carefully under good light. Moisture intrusion often shows first as discoloration at the dial edges or around the numeral feet. The embossed silver numerals and markers should be crisp and even. Any separation, peeling, or loss of the silver finish on the embossed details is worth factoring into your assessment. Avoid any attempt to clean this dial, since the lacquer finish does not survive cleaning without loss. |
| Crystal | The A-503 would have originally used a domed acrylic crystal. Check for deep scratches or a hazy, crazed surface, which can happen when acrylic ages or has been cleaned with solvents. Light scratches are normal and polishable, but a deeply gouged or crazed crystal needs replacement before the watch is wearable. |
| Movement | The watch should run from wrist motion and keep going without manual intervention. If it only runs when shaken or hand-wound, dried lubricants are the likely cause after sixty-plus years. Listen for any irregular ticking or stopping and starting, which can point to worn keyless works or mainspring issues. |
| Case | The stainless steel case is round with swept lugs. Check the lug tips for thinning from over-polishing, which is common on watches that have been buffed repeatedly. The caseback should close flush and show no signs of forced entry, which can distort the seal groove and compromise weatherproofing. |
| Crown | Pull the crown through its positions and confirm it moves smoothly between winding and setting without slipping or grinding. A loose or wobbly crown can indicate a worn or damaged stem, and on single-piece cases like this one, stem removal carries some risk of breaking the two-piece stem design, so it is better to catch crown issues before service than to discover them on the bench. |
The Movement
The caliber 689 and its variant, the 689A, are 17-jewel automatic movements that wind from the natural motion of the wrist through a bidirectional rotor system. They are compact, reliable calibers that Hamilton used across a range of Accumatic models in this period. The 689A designation typically indicates a minor refinement to the base 689, though both share the same service approach and general character.