Apparently there were 9 different Gremlins in this set, I have 7 so I have a ways to go!
01-028 v1 B was used by Dennis Mize as the Basis for the Gremlin in the 99-001 Witches Caldron boxed game, one of the few occasions where Tom Meier's work was reworked by another sculptor.
01-028 v2B, which replaced 01-028 v1b is first shown in the 1983 Armory catalog but doesn't appear in the RP catalogs until 1987. It seems to have been based on 01-005 v4. Two of the version 3 set seem to have been original sculpts but 01-028 v3B looks to have been a version of 01-005 v5.
Sculptor:
Tom Meier
Painter:
Dean Chow, Richard Abbott