Small is the word that comes to mind when describing this lens. It's absolutely tiny. Hidden within that small package is a decent enough lens. Not particularly fast, rare, or amazing the only real noteworthy traits of this lens are its size and price. You can find them for a song and a dance all over the place but watch out that you get a good copy or at least purchase from a service with buyer protection. My copy was advertised as "Like New" through a seller on Amazon but what arrived... well wasn't anywhere near that condition. It's beat to hell with damage to the optics. Thanks to the good buyer protection on Amazon I was refunded easily enough but it's a good lesson in caveat emptor. I honestly can't recommend them for photography but as a collectors item I think they're novel.
Specifications
Mount: M42 Screw Mount
Focal Length: 50mm
Aperture Range: f/3.5 - f/16
Minimum Focus: 0.65m
Weight: 75g
Filter Thread: 35.5mm
Data Source: All Photo Lenses - Camerapedia
Collection Information
Date Acquired: 05/12/19
Serial Number: 7388427
Purchase Price: Free - Originally $19 but refunded due to condition
Going Price: ~$25
Condition: Very rough with optical damage