Accumatic A-450
1963–1964 · 10k Yellow Gold Filled / Stainless Steel · Automatic
About the Accumatic A-450
Made from 1963 through 1964, the Accumatic A-450 pairs Hamilton's caliber 689 automatic movement with a circular 10K yellow Gold Filled case and stainless steel back. The white dial carries embossed gold numerals at 3, 6, 9, and 12, embossed gold stick markers at the remaining positions, and a date window at 3 o'clock read by the sweep seconds hand. The A-450 is part of the broader Accumatic family, Hamilton's line of automatic dress watches that ran through the 1960s alongside the Thin-o-matic series.
The embossed gold numerals and markers on the A-450 are a detail worth paying attention to. Unlike printed dials, embossed elements have physical dimension, which holds up better over decades and makes a well-preserved example feel genuinely crisp. The date window at 3 is a practical addition that keeps the layout clean without crowding the dial, and on a one-year model like this, finding one in honest, unpolished condition is satisfying.
From the Catalog
Hamilton listed the A-450 in 1963 with a 10K yellow gold-filled case and stainless steel back on a bracelet, priced at $95.00, which put it in the mid-range of the Accumatic lineup for that year.
Hamilton Catalog Images
1963
1964
What to Look For
| Dial | Look closely at the embossed gold numerals and markers. They should have clean definition and no separation or detachment from the dial surface. Check the date window aperture edges for any flaking or discoloration, and confirm the white dial finish is even with no spotting or moisture damage. |
| Crystal | The crystal should be clear and free of deep scratches or crazing. A hazy or yellowed crystal can usually be replaced, but confirm the correct diameter is available before buying if the existing one is damaged. |
| Movement | The caliber 689 is an automatic that should wind from wrist motion and keep running without manual intervention. If the watch only runs when shaken vigorously, the rotor or winding mechanism may need attention. After 60 years, dried lubricants are common, and a full service is the right starting point for any example that hasn't been recently serviced. |
| Case | 10K gold-filled cases can show wear through to the base metal on high-contact areas like the lugs and caseback edges. Look for bright silver or brassy patches in those spots. Swept lugs are also prone to thinning from polishing, so check that the lug profile still looks crisp rather than rounded over. |
| Crown | The crown should seat firmly and operate smoothly through both winding and date-setting positions. A loose or sticky crown can indicate a worn stem or a seal issue, both of which are addressable but worth factoring in. |
The Movement
The caliber 689 and its variant the 689A are 17-jewel automatic movements that Hamilton used across several Accumatic references in the 1960s. The rotor winds the mainspring through normal wrist motion, so there is no need to manually wind the watch during regular wear. These are solid, serviceable movements, though reassembly requires careful alignment of the gear train, and the glucydur balance wheel cannot be repoised by hand if it ever needs that level of attention.