The H-S Duramatic you are looking at, SN 2115XXX, was made in 1969.
H-S Duramatic #101: .22LR cal, 4 1/2" or 6 3/4" barrel, thumb screw take down, push button magazine release, fixed sights, plastic grips, M-100 or M-101 stamped on right side of slide, Mfg'd. 1954 to 1970. Also sold by SEARS as their 'J.C. Higgins' Model 80.