I see that the two illustrated for the Maritime Museum differ in barrel length. This one, illustrated here by Danno, has had the barrel shortened - visible clearly in the picture showing the muzzle head on - and that corresponds to the one pictured at
However the pistol listed as AAA2415 has a longer barrel extending beyond the nose cap.
I was surprised to see the cut-off barrel and the bright metal from the slicing but even more surprised to see that one at the museum matched it in that respect. I suppose I have been deprived in my education - I don't believe I had ever seen one of these circumsized.