Pre-Rogue Trader Citadel Miniatures Space Marines. Bob Naismith, mid-80s.
I’m sorry but I have no idea who painted these so can’t give credit where credit is due :(
EDIT - They are the work of Curtis Fell of Ramshackle Games. Curtis sells post-apoc resin figures many of which will be of interest to Rogue Trader-era 40K enthusiasts.