This 1988 Jes Goodwin sculpt was simply marked “EXO” on the tab – no mention of the retroactively added Saturnine name in the flyers/catalogues/rulebook of the time.
I haven’t noticed that patterning on the feet of any other contemporary Space Marines! This guy appears in the flyers as 410609 Terminator Marine.
He can be seen in some artwork by Pete Knifton in White Dwarf #109 (Jan 1989):
Undercoated:
More to come.