Automatic K-501
1954–1956 · Stainless Steel · Automatic
About the Automatic K-501
Made from 1954 through 1956, the Automatic K-501 is part of Hamilton's broader Automatic family, the line that brought self-winding movements to Hamilton's domestic catalog in the postwar years. It ran on either the caliber 658 or caliber 661, both 17-jewel automatic movements, and came in a stainless steel round case with one of two dial configurations: embossed luminous markers only, or embossed numerals and luminous markers at 3, 6, 9, and 12. The sweep seconds hand was standard on both versions.
Embossed dials like the ones on the K-501 are more vulnerable to damage than printed dials, so look closely at the raised figures before buying. The luminous material on markers and hands also ages differently across examples, and while some show even, honey-toned patina, others have had lume repainted at some point, which changes the look considerably.
From the Catalog
Hamilton offered the K-501 in 1954 at $72.50 on a strap or $75.00 on a bracelet, positioning it as an accessible entry into the self-winding lineup. The official description called out the embossed dial construction and luminous markers as the headline features, and buyers could choose between markers-only or the version with numerals at the quarters.
Hamilton Catalog Images
1954
1955
What to Look For
| Dial | The embossed numerals and markers are the defining visual feature here, so inspect them carefully. Chips, separation at the edges, or signs of moisture intrusion under the surface are all worth factoring into value. Check whether the luminous fill is original or has been touched up, as repainted lume rarely matches the character of the aged original. |
| Crystal | The K-501 uses a crystal-accessed case, meaning the movement is reached by removing the crystal rather than prying off the case back. Look for scratches or tool marks around the case back edge from anyone who tried to open it the wrong way, and check that the crystal itself is properly seated and free of deep gouges. |
| Movement | Ask whether this watch has been serviced. Dried oil on an unserviced automatic creates friction that can stop the movement entirely, and a caliber 661 that winds but won't run reliably is often just in need of a proper cleaning rather than parts. |
| Case | Stainless steel holds up well, but check the lugs for thinning from polishing and the case flanks for any evidence of someone trying to force open the back. The swept lugs on this case style can look soft and rounded on heavily polished examples. |
| Crown | Confirm the crown screws in smoothly and that the stem feels secure. A loose or wobbly crown can indicate a worn stem or a stem that has been replaced with a close-but-not-correct substitute. |
The Movement
The caliber 658 and 661 are closely related Hamilton automatics, both running at 17 jewels, and both designed around a bidirectional rotor that winds the mainspring through normal wrist motion. They are robust movements with a long service history, though like any automatic from this era, they need periodic cleaning and oiling to stay healthy. A well-serviced example keeps good time and winds reliably.