Back to the facts, for me, chronologically we have :
-69's with DON till the fall 1970
-69's with a transitional misprint DNN 220 bezel till jan-feb 1971
-69's with DNN till late 1971 (are there any 1972 -69s known?) including straight writing but no No NASA casebacks
-71's with No NASA casebacks came then till the engraved 'Flight qualified blah blah' caseback comes out and remains unchanged till nowadays
Did I miss something? If not,
@Jpr maybe you will agree with my statement above, your Speedy to have a wrong caseback. At least now it is a bit more factual
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