Automatic K-455
1956–1958 · 10k Yellow Gold Filled / Stainless Steel · Automatic
About the Automatic K-455
Made from 1956 through 1958, the Automatic K-455 is part of Hamilton's broader Automatic family and runs on the caliber 661, a 17-jewel self-winding movement. The case is 10K yellow Gold Filled with a stainless steel back, and Hamilton offered it with either a strap or a bracelet at slightly different price points. The dial is white with applied gold numerals and gold dot indices, and Hamilton specified 18K gold for the numerals and luminous dots, paired with a pearled minute track. The Transcontinental A is a closely related model worth knowing if you're researching this ref.
Finding one with the dial intact is the real challenge here. The luminous material on the dots can degrade unevenly, and examples with consistent, unrestored lume are genuinely harder to come by than the watches themselves. The pearled minute track is a nice detail that shows up well on clean dials but can look tired fast if the dial has been exposed to moisture or amateur cleaning.
From the Catalog
Hamilton's 1956 catalog described the K-455 as having a 10K yellow gold-filled case with a stainless steel back, 18K gold numerals and luminous dots, a pearled track, and a waterproof rating. It retailed for $89.50 on a strap or $95.00 on a bracelet.
Hamilton Catalog Images
1956
1957
1958
What to Look For
| Dial | Look closely at the applied gold numerals and luminous dots for any separation, discoloration, or signs of moisture damage. The pearled minute track is a fine detail that can fade or flatten if the dial has been polished or cleaned improperly. Check that lume degradation is even across all the dots rather than patchy, which can indicate past water intrusion. |
| Crystal | The crystal should be clear with no deep crazing or yellowing. Replacements are available and acceptable, but a badly degraded original can obscure how clean the dial underneath actually is. |
| Movement | On a caliber 661 that has been sitting for years without service, dried oil can build up enough friction to stop the rotor or leave the movement running sluggishly. Ask about service history and watch the sweep seconds hand for smooth, consistent motion rather than stuttering. |
| Case | The 10K yellow gold-filled case can show wear through to the base metal at the lugs and high contact points. Some wear is expected, but check that it's cosmetic rather than structural. Also note that the original waterproof rating is not something to test on a 60-plus-year-old watch, regardless of what the catalog said. |
| Crown | Check that the crown screws down or seats correctly and that there's no wobble or stripped feel. A damaged crown on a watch marketed as waterproof suggests someone may have forced it or ignored a problem. |
The Movement
The caliber 661 is a 17-jewel automatic made by Hamilton in the United States. It winds itself via a rotor that spins as the watch moves on the wrist, transferring energy to the mainspring without any manual winding needed. It's a reliable caliber from this era, though like any automatic that has been sitting unused for years, it responds well to a proper clean and oil before being put back into daily wear.