Bottom of filter
The FP-1 was a dust filter available in Russia, during the post-USSR period. It is a small white canister that contains a single corrugated particulate-filtering layer. The filter has a plastic top-cap and the bottom of the FP-1 is sealed by a black rubber plug. Due to the filter not containing substantial amounts of filtering medium, the FP-1 is an incredibly light filter. It was most likely used as a pre-filter in conjunction with other industrial filters.
This filter has a small stamp on it: СЩ02 - this is a Russian safety standard that these filters conform to.
Inside, showing particulate filter
The year of manufacture is also found on the front of the filter. In the gallery, one can see 99, which indicates that the filter was made in the year 1999. It is not known when production of these filters ended, but it is likely to be somewhere in the early/mid 2000s.