There were three versions of the NID field. If the one you're looking at has the roll stamped dog, it is either the 1st version or the "Star Grade". Both have the "snail ears" cocking indicators, but the Star Model is much the nicer gun.The third version of the NID field did away with the snail ear cocking indicators and the roll-stamped dog.

The 2nd version, the "Star Grade" is the best choice of the three, IMHO...Geo