Jupiter-21 M

Focal length-200mm
Relative aperture - 1:4
Aperture set - Zenit EM type - from 4 to 22
Focusing from 1.8m to infinite

Resolution:
In center - 50:
at the edges - 36

Weight - 980gr

From the 2 different makers marks it must have been in production when the factory switched logos. NathanDayton