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Common sense would dictate that A was for the 3rd version but not so. It appears that the prefixes, A & B signified production lines at the factory in the early years!
The 5th version we discovered has a 6-digit serial number with and without lettered prefixes on the body.
When Johnson World Wide (JWW) purchased Mitchell, the previous system of identification was discontinued.
The 6th and all subsequent versions up to 1956 have 6 or 7 digit serial numbers on the body with no lettered prefixes.