This privacy lock/door knob set is by Yale. It comes in it's original box and has the "How to" step by step installation page (which has a stain on it). Also included in this set is the wall/door plate/strike, both knobs, an unopened bag of screws, latch unit, the hole template, and the spanner wrench. Actual key is not included.
It is part of the 5400 series cylindrical locks, #5402. The specific design is called Litchfield.
This privacy locks set appears in very good pre-owned use, with a couple of small scratches on the handle near the key hole.