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It looks like the M22 did not come out 'till '67. Not to say it could not have been changed at some point. Find the serial #. '63 to '66 do not have a year designator in the seial #. Example P0101 would mean

P- Muncie 4 speed

01 - January

01 - the 1st day

From '67 to '68 the month got a letter code and the year code is present.

Example - P8A01 :

P - Muncie 4 speed

8 - 1968

A - January

01 - 1st day

'68 through '74 have a letter at the end to code the ratio.

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10y ago

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