UV-1x
40,5mm ultraviolet lens filter
LZOS, USSR

Perfect condition. Fully operational. There are no scratches, cleavages, fungus. Metal rim has small signs of age.

Lenses "Jupiter-8" and "Jupiter-12" are not included and shown as an example of mount.

This filter has 40.5x0.5 mount and is designed for popular USSR rangefinder lenses: Jupiter-8 (both silver and black), Jupiter-8m, Helios-103, Industar-26m, Industar-61L/D, Industar-61, Jupiter-12, T-22 (lower lens at all "Lubitel" TLR cameras) and others.
This is a classic ultraviolet clear filter. Its aim is to weaken ultraviolet.
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Weight - 9 g 
Mount (mm) - 40.5x0.5
External size (mm) - 42x8