Heuer Trackmate 593 Circa 1970s 1/10 Second Stopwatch

HEUER Trackmate 1/10 - 30 Second, 15 Minute Stopwatch, Rare Swiss Timer
Year: circa 1970s,
Heuer Ref: 593,
Heuer-Leonidas Calibre: BF 410 1-Jewel Movement,
51.5mm Stainless Steel Case (not including crown)
, Polished Stainless Steel Crown and Pusher,
White 30sec Dial with White 15min Sub-Dial
, Acrylic Crystal,
Original Heuer Case-back sticker.