is an acronym for General Service Timepiece/Temporary Pattern mark for the British Army specifically. stamp with the arrow pointing up was a temporary marking for official British military timepieces from 1939 to 1945. The engraving on the case back of this watch tells the story. This Jaeger-LeCoultre Cal 457 served in the British military. Military pocket watches are a fast-growing segment of horological collecting especially watches used during World War II.
