jah4i,
The number you indicated on the Red Federal Tax Strip does in fact indicate a dating of 1968,...BUT, this only indicates which year the stamping license was issued to the Distillery/Bottler or Importer.
For more information on dating your bottle, please upload some clear photos of the bottle in question and we'll get you the information that you need.
Cheers,
Walter C Hurst
wchurst@hotmail.com