Chronograph G
1974–1976 · Stainless · Manual Wind
About the Chronograph G
Made from 1974 through 1976, the Chronograph G is a three-register manual wind chronograph built around Hamilton's caliber 643. The Chronograph G belongs to Hamilton's family of caliber 643 chronographs from this era, which also includes the Chronograph A, Chronograph B, Chrono-Diver, and Chronograph 360. What sets the G apart within that group is the three-register layout and the bold orange detailing.
The orange accents on the dial are the first thing to scrutinize on any example, since fading or discoloration there changes the whole character of the watch. Original examples carry a 1/5-second recorder track on the dial, and that detail is worth confirming when evaluating any particular piece.
From the Catalog
Hamilton listed the Chronograph G with a three-register black dial, 1/5-second recorder track, and water resistance in a stainless steel case, priced at $175.00 in 1974.
Hamilton Catalog Images
1974
1975
1976
What to Look For
| Dial | Look closely at the orange accents on the five-minute indexes and hour register. These are the most vulnerable elements on this dial and any fading, staining, or re-painting will be obvious. Confirm the 1/5-second recorder track is present and legible. |
| Crystal | Check for deep scratches or crazing. A correct replacement is straightforward, but a poorly fitted or wrong-profile crystal will look off on this case. |
| Movement | Ask about service history. The caliber 643 is a chronograph movement, and parts like the hour and minute hands can be genuinely difficult to source. Repairs on a movement like this are expensive, so a watch that hasn't been serviced in decades deserves serious scrutiny before purchase. |
| Case | That lug style tends to accumulate wear at the edges, and over-polished examples lose the crisp lines that define the design. Check for cracks or repairs around the lug roots. |
| Crown | Test the chronograph pushers and confirm they feel crisp, not sticky or frozen. A crown or pusher that doesn't engage cleanly suggests the movement needs attention before the watch is used. |
The Movement
The caliber 643 is a 17-jewel manual wind chronograph movement. It drives all three registers and includes a 1/5-second timing track on the dial side, making it a proper instrument-grade caliber rather than a dressed-up everyday movement. It is a capable movement when properly serviced, but parts availability is genuinely limited, so finding one in known good running condition matters more than usual.