Antique solid brass lock hardware... a half mortise lock and key set for a cabinet door or chest drawer. This is in good working condition.
The lock measures about 1 13/16" wide, 1 1/2" high and about 7/8" deep. The lock bolt extends about 3/16" when in the locked position.
This has wear and tarnish. The only markings we could find was the number 8 stamped on the skeleton key.