John, either that picture is the one I posted, or one like it, and the symbols are incorrect. In talking to Jan, (one photo was from his book, the other from Datig I think?), he said essentially the same thing, when he asked a Japanese reader, they said that the symbols were not tight, Jan said he didn't go much further with it, as he thought the gun he observed wouldn't have incorrect markings on it, if real.
That is from memory, so I could be convoluting my thinking,
Ed