HAMILTON JAZZMASTER AUTOMATIC WATCH.

A Hamilton Jazzmaster Open Heart Automatic Watch

Dial: Metallic blue‑green sunburst dial with open‑heart apertures exposing the balance wheel and gear train.

Markers & hands: Polished silver indices and dauphine‑style hands.

Case & bracelet: Stainless steel, brushed/polished finish, matching steel bracelet.

Crystal: Sapphire, scratch‑resistant.

Case back: Open (exhibition) sapphire case back.

Text on dial: “HAMILTON”, “automatic”, “SWISS MADE”.

Movement
Caliber: Hamilton H‑10

Type: Swiss automatic (self‑winding)

Power reserve: 80 hours

Balance spring: Nivachron™ (anti‑magnetic alloy)

Functions: Hours, minutes, seconds (no date on most Open Heart variants).

Specifications:
Case size 40 mm
Thickness 11.05 mm
Case material Stainless steel
Dial color Blue / blue‑green metallic (variant of the Jazzmaster Open Heart)
Crystal Sapphire, anti‑reflective
Case back Sapphire exhibition
Water resistance 5 bar (50 m)
Lug width 20 mm
Movement H‑10 automatic
Power reserve 80 hours
Bracelet Stainless‑steel (your image shows bracelet; official spec often lists leather, but bracelet variants exist)
Country of origin Switzerland.