I just purchased a Kalamazoo mandolin. I think it's a KM-22 as it's got front and rear binding, plus binding on the fretboard and the pickguard. Will post some pictures soon. I took the pickguard off and found the FON 1048D 45. The 1048 is clear, but I thought the D could be a B, but it might be the wood grain running through. The 45 is written in pencil while the rest is stamped. I checked and looks like this is a 1938 if that is indeed a D in the FON...maybe near the beginning of the KM-22 run. But, I guess it could be a fancy KM-21...I read somewhere they offered all these options as well. It came with a cool brown/black Geib Challenge case.
I am a big fan of Kalamazoo's... My KM 22 is posted here, it is the middle instrument in the first photo as well as #2 and 3: https://www.mandolincafe.com/forum/g...hp?groupid=308 post a picture when you can G