Arsenal Industar-50 50mm f3.5 SnN67019499 Filter Thread: It uses an

Filter Thread: It uses an unusual

Optical Formula: 4 elements in 3 groups

it has a 45

Note: Because this was built for early Soviet Zenit SLRs rather than rangefinders

While the Industar-50 was primarily mass-produced by the KMZ factory near Moscow

Arsenal Industar-50 50mm f3.5 SnN67019499 Filter Thread: It uses anThis Arsenal Industar 50 50mm f 3. 5 (Serial Number 67019499) is a fascinating piece of Soviet optical history with a unique provenance. While the Industar 50 was primarily mass produced by the KMZ factory near Moscow, your specific copy was manufactured by the Arsenal factory in Kyiv, Ukraine (indicated by the "Arsenal" branding) and was originally sold or cataloged by specialty vintage vendors like WOW Vintage Optics. [1, 2] Decoding your serial