OAL: 2" - Unmarked, Dosick, 1930's Single Shot, tilt down barrel. It's nickel plated brass with mother of pearl grips. It is missing the other side of the MOP grip. Listed in "The Tiniest Guns" by Bob Urso Vol. 3 on page 76 as U1.
Click on the photo to the right for a larger view.
Dosick 2mm Pinfire with MOP Grip Unmarked - DSCKMOP1.D Datasheet