Antique Rim Latch

Iron case
Steel latch, sliding deadbolt and switch
Steel latch
Reversible to suit both left and right-handed doors

Approximate measurements:-
Width - 4 1/2" (116mm)
Height (max) - 3 3/4" (94mm)
Follower (knob) backset - 3 5/16" (85mm)
Follower opening size - 1/4" (6.5mm) *Note this is smaller than the modern standard

Lock is in very good working order. Keep is missing (excellent cast replacements are widely available).