Historical information
Metrawatt of Germany made the Horvex line of meters, of which there are three major versions. The original came out just before the war. The Horvex 2 is from the mid-50s, and this Horvex 3 showed up around 1960.
Physical description
a) 'Horvex 3' light or exposure meter made in Germany. Cream bakelite enclosing metal meter. 'Horvex 3 ' on front panel
b) Brown leather case for the 'Horvex 3 ' embossed on front loops for strap on back