Sinn 815
(pronounced "zin")

Case Diameter: 39 mm
Case Height: 11 mm
Case length: 44 mm
Lug Width: 20 mm
Movement: 7 jewel ETA 955.112 quartz, hacking
Case material: Stainless steel
Crown: Screw down.
Bezel: Uni-directional, indexed
w/ 60 clicks
Water resistance: not rated
Vintage: early '90s
If you think these two watches (below) look
similar, you're right. They both use the same case.