Here's a look at the 1/16 scale Life-Like BSA Grand Prix Racer motorcycle, kit number 00153/M-153, released in 1970. One long side of the box mentions the kit is "Manufactured under license from Pyro Plastics Corp, N.J.", copyright 1970, but it appears to be a straight reissue of the earlier Pyro kit from 1967:
The Life-Like reissue features very similar, but expanded artwork:
All parts together (clear parts and tires placed in modern bags):
The instruction sheet features typical exploded-view style assembly steps, as well as two panels which list other Life-Like kits available at the time:
Clear parts include a nicely engraved headlight lens, center stand base, and windshield: