This guy is part number 070270/1 and can be seen on the Armour Variants page in the 1991 Blue catalogue. He’s shown in White Dwarf 123 (March 1990) as “Urban Camouflage Imperial Fist Marine in Armour Variant”:
The details on the base have been filed off, unfortunately.
Colours used:
Undercoat: Vallejo Mecha Black
Blue: Scale75 Art Cobalt Blue, highlighted/shaded mixed with Pro Acryl Titanium White and Scale75 Art Black
Red: Pro Acryl Bold Pyrrole Red, highlighted with a mix of Bold Pyrrole Red and Pro Acryl Golden Yellow, washed with Targor Rageshade
Base: Reddish Brown around the rim, then Natural Soil, then Sand, then a highlight of Gypsum on the rock
Gold: Necro Gold, washed with Targor Rageshade, then Dwarven Gold, then Citrine Alchemy
Silver: Black Metal, washed with Targor Rageshade, then Heavy Metal, then Speed Metal
Green: Scale75 Inktense White and Lime
White: Pro Acryl Titanium, shaded by mixing with Cobalt Blue
Decals washed with Cobalt Blue to dull the white somewhat then highlighted with Titanium White
This is Captain Romero from the Rogue Trader era. He was later shown in the catalogues as Chain Sword and Bolter 070119/29 and is also seen in White Dwarf 99 (March 1988).
He seems to be named after Cesar Romero, who played the Joker in the 1960s Batman TV series.
This guy is from the Armour Variants set which was designed by Jes Goodwin and the Citadel Design Team. He shows up in the 1991 catalogue as part number 070270/3. The earliest I can find him in a White Dwarf is March 1990:
The blurb for the Armour Variants goes:
“In the last 5000 years the design of Space Marine armour has evolved through many stages, from Mark 1 to the Mark 8. Many chapters still use all the different types, with the early models regarded as the Chapters Heirlooms. These early armours, once worn by the Chapter’s greatest heroes, have been embellished by the Chaplains Artificers, who create the Chapters equipment and honour badges.”
Nothing on the front or back of the tab on this one, unfortunately.
Undercoat: Vallejo Mecha Black
Blue: Scale75 Art Cobalt Blue, combined with Pro Acryl Titanium White for lighter areas and Scale75 Art Black for darker.
Red: Pro Acryl Bold Pyrrole Red, shaded with Targor Rageshade, highlighted with Bold Pyrrole Red/Golden Yellow
Green: Scale75 Art Spring Green, shaded with Art Black, highlighted with Golden Yellow
Silver: Black Metal, Targor Rageshade, Heavy Metal, Speed Metal
Base: Scale75 Soilworks Reddish Brown around edges, then Dark Mud over that to try something different, then Natural Soil, then Sand in the center, highlight on the rock was Gypsum. The legs were dusted with Natural Soil.