In 1970 there was a revision to defense standards 66-4, 'DEF-STAN 66-4' by the Ministry of Defense, 'MoD'. Although a simple change,itallowed for pilot's chronographs to feature two "push pieces."Prior to this theMoDdesigns called for single button chronographs that required specialized movements, these were mostly by Lemania.

Four brandscame to the party; Hamilton, CWC, Newmark, and Precista. These brands utilized the Valjoux 7733 movement for their MoD chronographs and are known as the 'Fab Four' by collectors.

The T in the circle refers to tritium lume used on the dial and the arrow or "Broad Arrow" signifies the watch was for the British Ministry of Defense.

Brand: Hamilton
Reference: 0552/924-3306
Material: Stainless steel
Dimensions: 38mm diameter; 12.5mm thickness
Crystal: Plexiglass
Lume: Yes, tritium
Caliber: Hamilton signed Valjoux, manually-wound, caliber 7733
Lug Width: 20mm
Box/Papers: No

CONDITION & SERVICING
-Thedial ismatte blackcolor and is inexcellent condition.
-Hands are in very good condition, both being even in color.
- Case is unpolished, edges are sharp. Minor hairlines but overall a really nice example.
-Service history is unknown but is running to spec.