This little meter is made by Gossen in Germany, in the late ’50s. It was meant to be used as a companion to the meterless Minox A/II/III/IIIs, so as to make sure one assessed in a proper manner the light when snapping away with the little Minox camera.
The bottom has a thumb dial which is rotated to move the barrel and it’s numbers into place. The top of the barrel has a symbol. The table on the back shows symbols and reference the film speed. The accompanying table has readings for f3.5 (centre) and columns headed f2, f2.8, f5.6 and f8. Whole seconds are silver on black back ground and fractions of a second are black numbers on a silver background. The conversion table and instructions enable settings from f1.4 to f32.
Early light meters have no serial number. The ASA/DIN scales read ASA 10, 20, 40 and 80 next to a DIN scale 11, 14, 17 and 20, then ASA 12, 25, 50 and 100. Later models have a scale of ASA 25, 50, 100, 200. One version, with ASA scale 12, 25, 50, 100 uses colour coded dots instead of the blank, square, triangle and rectangle symbols.No filters. I usually use it with 35 or 120 film as well.
I am still using one, purchased with my IIIs user some 15 years ago, and is still dead accurate. Lucky I guess. Many are worn and way out of reading. For example, I have 4 sets of Minox IIIs and their meters…these I kept mainly because of the working meters. However, I have to get rid of at least 3 other meters, due to non working or badly decayed cells. Stupid me, I should’ve known that sooner or later, someone will appear on the market with cell replacements.