This guy was one of the original Mark Copplestone Techmarine sculpts – 410501 – and shown later as 070133/72.
He can be seen in White Dwarf #107:
Tag: WD107
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Games Workshop Imperial Assassin with Combi Weapon
This vintage Imperial Assassin with Combi Weapon from Rogue Trader was a Jes Goodwin 1988 sculpt. He was part number 072117/28.
As seen in White Dwarf #107:
Stripped:
A 360degree video of it: