This metal Rogue Trader miniature was one of the original Mechanicus sculpts by Bob Olley. I can’t make out the year on the back of the tab. He goes by 401101 or 051301.
He can be seen in White Dwarf #111:
…and again in White Dwarf #112, painted by Paul Benson:
Pete Knifton has an illustration in White Dwarf #110 which looks remarkably like him, though he has swapped which way he’s holding the axe:
