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For what model? 2-sp or 3?
70/2E and 71/2B til 9-71 had veriable speed then 3-sp after that.
Bet RA 72 is not correct either.
Stating in 73 all -3speeds had a plastic cover

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the diff between 3 speeds and variable is actually at the switch not really at the motor

Dunno what you mean about "plastic" cover

the diff between earliers and lates at least on 3/var speeds is lates have a "tower" on cap ( maybe this is what you meant about the plastic cover ? ) for the parking and turn off switch, and earliers are flat