IMHO, the 65cc chambered heads are still big. Anyway, as you already know, it was "born" on June 23, 1971. The D0OE were used from 1970 through 1980, and came with both 60cc and 69cc combustion chamber sizes. There should be a dash and another letter following the D0OE (ie: D0OE-B, or D0OE-G, etc.). That would confirm which one you have.
Take care,
-Chris
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