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Mack AC engine number?

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I just found some numbers on my AC engine crank case.  On the horizontal machined surface by the magneto there is BC12-36 ( the - is a #1 sideways.)

On the vertical surface below the magneto 411A62 is stamped upside down then a long space then 33 right side up.

Do any of these make sense to anyone?

Thank you,



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