Circa 1992 per the June 1992 date stamp on the plastic case. It's in very good condition and shows very little use. Most of the wear is storage wear and most of the of the sockets appear to not have been used at all. The 1/2 ratchet is a V ratchet and the 3/8 and 1/4 ratchets are VF ratchets. Socket spinner handle is V.
The sockets are a combination of mostly non-inverted G with some V and VV sockets. The only significant flaw in this set is that the plastic hinge on the case is starting to show some cracking from the plastic becoming brittle from old age, which happens with all of these vintage sets as plastic flex hinges molded with the case were used in those days instead of the two piece hinges with an actual pin that are used on better tool sets these days.