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All available information must be taken as a whole, and, combined with some general tips and observations provided below, a narrow range of probable production years can be arrived at which in many cases will be accurate enough for most people's desires.
One thing to remember in this chronological quest is these instruments were built to be played, not (in most cases) to become museum pieces.
Even the above is fraught with some risk, as replacement parts used for repair or modification will occasionally skew the overall picture.
This information is being compiled, organized and edited into a soon to be released book that details all sorts of production and manufacturing information, including tables showing serial numbers and their date of production.
Don't get too hung up on searching for temporal coordinates to the exclusion of the unit's real purpose as a musical instrument.
Some of the component parts of Hammonds and Leslies have EIA codes printed on them.
Just to get started, 21H's are 1951 to 1958, 22H's are 1958 to 1963, 122/142/147/145's are late 1963 and later.
Any other single speed model (45/47/51) is prior to late 1963.