I am on the same mission to discover the real origin behind the UNION automatic pistol as well. I have in my possesion a UNION II automatic pistol. In doing my research I found that it is not a spanish 'ruby', but in fact it is french. I have not found out what my markings mean... but I found a stamp/markings diagram for older guns and the pistol might have been used in WWII by someone in the German Army... Not sure though... My stamps are a prancing lion, a capital "A" with a dot on the top, and a shield with an older knight helmet on top with an "X" in the middle of the shield. I also have a name that is scratched into the pistol case. "Winston Thompson". Not sure who that is but I am willing to give this search a go.