The Model 72A experienced some re-built pieces, notably a solid lifter; the previous one was split. Model 72s experienced no pull-pounds adjustment screw as is found on the 69As. It was supplied from about 1959-1963. One more defining characteristic of the JTSS is it came which has a Winchester 93B https://highimpactrounds.com/product/winchester-ammunition-long-beard-xr-20-gauge-3in-6-1-1-4-oz-shot-lok-lead-1000fps-10-rd-box/