This guy is one of the few Warhammer 40K Space Marines to come with Errant Armour (Mark 8) and is a 1990 sculpt. He’s part number 70106/57 or 070360/1 and was sculpted by Jes Goodwin as per the 1994 catalogue.
A 360 degree view:
You can see Jes Goodwin’s sketch of Mk8 armour in the Index Astartes Apocrypha book (will be from a WD issue somewhere I haven’t found yet):
I painted this chap up as a squad leader for a Tactical squad, and did his left knee in chequered company colours. A WIP of his knee:
Colours used:
Undercoat: Vallejo Mecha Black
Base coat: Scale75 Cobalt Blue, brought up with Primary Blue, shaded with Prussian Blue, highlighted with a mix of Primary Blue and Art White
Red: Art White, followed by Primary Red, shaded with Crimson, shaded with a mix of Prussian Blue and Primary Red, highlighted with a mix of Primary Red and Orange