Auto Cal Sierra
1976–1977 · 14k Gold Electroplate / Stainless Steel
About the Auto Cal Sierra
Made from 1976 through 1977, the Auto Cal Sierra carries a 14k Gold Electroplate over stainless steel case in a round 36mm profile, powered by the Swiss-made Hamilton caliber 836 automatic movement with 17 jewels. The Sierra is part of Hamilton's Auto Cal family, a line that leaned into automatic convenience during a period when Hamilton was deep into its Swiss manufacturing transition. The gilt degrade dial gives this model a distinctive character that sets it apart from the plainer dial treatments common in the Auto Cal lineup at the time.
Solid 14k gold cases from this era tend to survive better than electroplated ones, but that doesn't mean every Sierra comes through unscathed. The gilt degrade dial is the most visually interesting thing about this watch, so condition there matters more than usual.
From the Catalog
Hamilton offered the Sierra in 1976 at $140.00, pairing the 14k gold electroplate case with a stainless steel screw-down case back and the gilt degrade dial. The fact sheet notes that the production Sierra used a solid gold case rather than electroplate, which makes the catalog description worth keeping in mind when evaluating any example you encounter.
Hamilton Catalog Images
1976
1977
What to Look For
| Dial | The gilt degrade dial is the centerpiece of this watch. Look for fading, spotting, or separation at the edges, which can appear on dials of this construction. A clean degrade with good color transition is what you want. |
| Crystal | Check for deep scratches or crazing in the acrylic crystal. Replacements are available, but confirm the profile matches the original before committing. |
| Movement | Ask about service history. The caliber 836 is a reliable movement, but dried oil creates enough friction to stop it even when the watch appears to wind and set normally. A watch that runs well for an hour and then fades is a classic sign of an overdue service. |
| Case | Solid gold polishes out well, but heavily worked cases lose their original sharpness. |
| Crown | Work the crown through winding and hand-setting. It should feel smooth and engage cleanly. A crown that slips or feels gritty often points to a worn stem or a movement that needs attention. |
The Movement
The caliber 836 is a Swiss-made automatic movement produced by ETA and used by Hamilton during this period of its Swiss manufacturing transition. Running at 17 jewels, it winds bidirectionally via a rotor and keeps reliable time when properly serviced. It's a straightforward, well-supported movement with parts still available, which makes it a practical choice for a daily wearer.