stainless steel version, proof 1978, condition 3, does not correspond to an existing historic model!
proof 1975, condition 3.
lock engraved, brass furniture, condition 4.
colour hardened frame and seating lever, brass frame, proof 1972, condition 3.
proof 1973, barrel bulged in rear half, condition 4.
barrel 6" (presumably shortened), proof 1975, somewhat spotty, condition 4.