Sears 22cal air rifle model12619300how much is it worth if anything?

I believe you are talking about a Crosman model 140 or 1400 first made in 1954 and then again in 1955-57, 1956-62, 1961-68. These were all Variations of the same model. For Years Crosman and Daisy made airguns under the J.C. Higgins name for Sears. All Crosman models for sears began with (126) and Daisy models began with (799) See the following web pages to verify this air Rifle. In 100% condition it's worth $135, 90%=$90, 60%=$55