1970s Seiko "Bullhead" Automatic Chronograph Ref. 6138-0060T.

Maker: Seiko

Model: Bullhead Automatic Chronograph

Reference: 6138-0060T

Year: Circa 1976

Case No: 633004

Material: Stainless steel

Dimensions: 43.5mm width x 45mm height; 15.3mm thickness

Crystal: Hardlex

Lume: Yes, tritium

Caliber: Seiko, self-winding, caliber 6138

Bracelet/Strap: Seiko, stainless steel, ref. Z040S bracelet

Lug Width: 20mmm