Lightmeter Sixtus (0434)
Info
Small lightmeter (meter itself approx 60 x 50 x 25 mm) in red leather case with closing flap.
Via the small front knob, the DIN sensitivity can be set.
The case of the meter is bakelite.
Seems the red button would be used in low light situation.
References/Links/More Info
Ollingers Light Meter Collection