I have a few different 'harpoon' spear type mole traps myself, some Dutch, English and US in origin (including a couple of Olmsted traps), but all variations on a common theme. The English 'Anglo Impassables' were patented back in 1888 by W Reed from Cornwall and I have seen about 8 variations of the same trap. Most were not marked but some have stamped ANGLO IMPASSABLE or CALLINGTON on them. The Dutch variants have MOLKAT stamped on theirs. The US Victor traps, Miles Reddick and others are pretty common steel strap variations still available for purchase today over on your side of the big pon