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I plan on getting a factory letter for this gun later, but cannot at the moment. The K-22 was my grandpas and now it's mine. The serial number is "K 254524". I have been doing as much research as I can and as far as I can tell it's made before 1955 because it is a five screw gun, but without getting the factory letter I am having trouble dating it beyond that. I see people in other threads know serial number ranges, but I haven't been able to find out how they know what the serial number ranges are. Sorry, no photos at the moment. Thanks for anyone that can help! Look forward to getting the letter later.