CAI is the name of an importer called Century International Arms, based in Vermont.

Your gun was re-imported into the US from abroad (god knows where)

They put these huge import markings on the gun, ruining it from a collector perspective. But most likely it's another worn out beat up gun with no collectors value anyway.

They are all over the gun auctions now. I dont think I would buy one based on a couple I have handled at gun shows (worn out, loose, beat up, ugly). Mostly model 19's, model 13's and model 10's.