Automatic K-475 Calendar
1960–1961 · 10k YGF
About the Automatic K-475 Calendar
Made from 1960 through 1961, the Automatic K-475 Calendar is part of Hamilton's broader Automatic family, a line that ran through much of the mid-century and gave Hamilton a strong foothold in the self-winding market. This particular model pairs the caliber 690 with an asymmetric case in 10k yellow Gold Filled and adds a date complication, which was still a meaningful selling point in 1960. The asymmetric case shape puts it in interesting company within the Automatic lineup, where most references leaned toward conventional round or tonneau forms.
Finding one with a clean dial and intact date window surround is the first thing to check, since calendar complications add one more place for moisture and wear to leave their mark over sixty-plus years. The asymmetric case can show uneven wear depending on how it sat on the wrist, so look carefully at all four sides rather than just the obvious high points. These came out of a two-year production window, which means surviving examples in solid shape are not as common as longer-running references.
Hamilton Catalog Images
1960
1961
What to Look For
| Dial | Look carefully around the date window. The aperture surround and any printing nearby is often the first place to show moisture damage or flaking. Check that the date wheel beneath shows clean, fully visible numerals with no fogging or discoloration. |
| Crystal | Asymmetric cases often use non-standard crystal shapes. Confirm the crystal fits the bezel correctly with no separation or gaps, and check for deep scratches that a flat crystal can't hide the way a domed one might. |
| Movement | The caliber 690 is an automatic and should wind from normal wrist motion. Dried lubricants are common on movements this age, and a watch running on dry oil generates friction that can stop it entirely. Ask about the service history before assuming a running watch is a healthy one. |
| Case | Gold filled cases wear through to base metal over time, especially on the back, lugs, and any raised edges. On an asymmetric case, look closely at the protruding portions of the case where contact with surfaces is greatest. The case back can be difficult to open without the right tools, so prying attempts leave marks. |
| Crown | Check that the crown screws or presses in smoothly and that the stem engages the setting position cleanly. A loose or wobbly crown often means a worn or replaced stem, and on a calendar watch, proper setting function matters for both time and date. |
The Movement
The caliber 690 is a self-winding movement, which means it captures energy from natural wrist motion through a rotor and winds the mainspring automatically. It was part of Hamilton's domestic automatic caliber development in the late 1950s and early 1960s, a capable workhorse movement suited to everyday wear. If you haven't seen service records, treat it as a candidate for a full service regardless of whether it's currently running.