Pete,
Agreed, 2203 on the barrel or frame would not go with a 1906. The first digit probably is a "5", and Dwight's observation that there may be an obscured first digit also is a possibility. Anyway, a 22xx frame should be a 1900 and I don't see any evidence of a removed toggle latch on the right frame rail. Pretty gun, I wonder what it is/was?
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If it's made after 1918...it's a reproduction
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