The inside of the screw-on caseback is signed
DROZ CO and has a manufacture date of 11-66.
The Super-Compressor's trademark dive helmet
can also be seen.

The Dual Crown Super-Compressor cases were
manufactured by Swiss casemaker Ervin Piquerez
and were rated to 200 meters water resistance. The
lower crown winds & sets the movement, the upper
crown turns the rotating inner bezel.

Other manufacturers to use the Dual Crown
Super-Compressor case include Longines, Bulova,
Jaeger Le Coultre and Zenith.

Other Super-Compressor watches:

Bulova Super-Compressor

Fortis Super-Compressor

Hamilton Super-Compressor
DROZ Dual Crown  Super-Compressor

Case Diameter: 42mm
Case Height: 14.5mm
Case length: 52 mm
Lug Width: 22 mm
Crowns: 6 mm, non-screw down
Crystal: 38.5 mm, domed acrylic
Movement: ETA 2472, 17j, 18,000 bph, power
reserve 42 hr
Case material: Stainless steel
Bezel: Internal bi-directional
Water resistance: 200 meters
Vintage: '60s (case is dated 11-66)