It does have an import mark on the bottom of the barrel "C.I.A ST. ALB. VT.". There are no "X" marks on the gun anywhere as I have seen in some of the threads on this forum. The side plate has the original marking marked out and a "34" scribed into the side of it, but on the inside of the sideplate has a "94".
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As for was matches and what dont. It looks like the whole toggle and then the sideplate are msimatched. The grips dont match as well, as you can see they are a little bigger than the grip itself.
As for where I found it... There is a fellow that I work with, his father in law is a gunsmith and has his curios and relics liscence living in south carolina. He has all kinda guns. Well he has dont a little bit of work on my other guns. Telling him about my 1900 AE, he told me he has never see one in person and actually held one. He does however have sveral lugers of his own. So, gladly I took over to him one day just as a little show and tell. Made him kinda happy to actually see one. Well he just so happened to call me last week telling me about this one. Kinda funny as I found the cracking in the toggle piece the same week and decided no more shooting of that gun, and then this one just fell in my lap. This fellow also has an old chinese 8mm mauser Thats got some unique markings that Im going to get next. Hell $75 for and old gun like that just to hold and have another show and tell gun. He said it looks just like the K98 german mauser, and actually has some german markings on it as well as chinese markings. So, next payday will be another old gun added to my collection.