Astramatic I
1957 · 18k Solid Yellow Gold · Automatic
About the Astramatic I
Made only in 1957, the Astramatic I is a high-grade automatic from Hamilton's mid-century American line, powered by the caliber 664, a 25-jewel automatic movement. The case is 18K yellow gold, and the silver dial carries applied 14K gold numerals at 3 and 9, applied 14K gold markers around the rest of the chapter ring, luminous dots, and a pearled track that gives the dial a refined, detailed quality. The Astramatic I is part of Hamilton's broader Astramatic family, which also includes the Astramatic II, and sits alongside other automatic offerings of the period that reflected Hamilton's push toward dressier automatic wristwatches in the 1950s.
The silver dial is the first thing to scrutinize on any example. Genuine silver-finished dials can develop a warm patina over decades, but it can also suffer from moisture damage, discoloration, or poorly executed refinishing that strips the pearled track detail. The combination of 18K gold case, 14K gold dial furniture, and a 25-jewel movement made this a serious luxury piece in 1957, and survivors in honest, unpolished condition are not common.
From the Catalog
Hamilton's 1957 catalog described this watch with an 18K yellow gold case, 14K gold numerals and markers on a sterling silver dial with luminous dots and a pearled track, and noted it as waterproof. It retailed for $225.00, placing it among Hamilton's more expensive strap watches of that year. As with all vintage watches, the original waterproof rating should not be relied upon today.
Hamilton Catalog Images
1957
What to Look For
| Dial | Examine the silver dial closely for moisture damage, uneven patina, or signs of refinishing. The pearled track detail is delicate and often the first thing lost if a dial has been cleaned or buffed. The applied 14K gold numerals and markers should sit cleanly and show no separation from the dial base, gaps at the base, or adhesive residue. |
| Crystal | Check for deep scratches or chips. A fresh crystal is an inexpensive fix, but confirm the replacement is correctly sized so it doesn't press on the dial or sit unevenly in the bezel. |
| Movement | The caliber 664 is a capable 25-jewel automatic, but dried oil is a genuine concern on any example that hasn't been serviced in years. Even a well-preserved case doesn't mean the movement inside has fared as well. Ask about service history, and if it's unknown, budget for a full service. |
| Case | The 18K yellow gold case should be inspected for heavy polishing, which rounds off the original lines and removes metal that can't be replaced. Look at the lugs especially. Light wear is expected and honest; a mirror-buffed case on a 60-plus-year-old watch is a red flag. |
| Crown | Confirm the crown is original and functions smoothly through winding. A replaced crown on a gold case should be gold-filled or gold at minimum. Mismatched crowns are common on vintage pieces and worth negotiating on if present. |
The Movement
The caliber 664 is a 25-jewel Swiss-made automatic, a higher jewel count than many of Hamilton's standard automatics from the same era, which reflects the premium positioning of the Astramatic I. It winds through a rotor mechanism, so normal wear on the wrist keeps it running without needing to hand-wind it regularly. The extra jewels reduce friction at key points in the gear train, contributing to both accuracy and longevity when the movement is properly lubricated.