Vintage Oval Silver Mortise Lock Thumb Turn Knob

Used to throw a deadbolt on mortise locks, these thumb turns were typically used on the inside of doors to bathrooms or bedrooms for privacy. Made of nickel plated brass with expected wear. Polish it up if you wish.

Back plate is 1” x 1-9/16” oval
The pin is 3/16” square and extends 3/4” into the door.