Hoppe single point door lock. Backset: 45mm(1.77"). Deadbolt Throw: 1 inch. M/45/25 16R. Manual gear. Replacement for Fuhr mortise locks.
A cost effective alternative to using a multipoint in any application where you want to use HOPPE handle sets.
Used on doors made by Caradco, Norco, WeatherShield, Bilt Best, and many others.