Bertram Chronos Exposure Meter
Circular form photoelectric exposure meter. The photocell is protected by spring loaded doors, opening automatically when the lid is opened. Single scale, numbered 0-15. Rotating calculator, f/scale 1.4-22, speed scale 6-200ASA with DIN and Sch.0 scales. Shutter scale 1/1600 sec - 4 minutes. Cine exposure time scale in lid. With ribbon strap. No. B 514853. c.1952