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@rive_gauche
so we could collectively deduce that the sprint was a lower range model due to lack of 'finessing'; and that it is prior to 86, and saarf is probably right on the money with 83, or earlier, not too early though because
1977 - columbus sl tubing introduced
1980 - brake bridge with cast square boss
1981 - chain stay bridge waisted spool piece
according to teh inerntnets..