if you have a certificate, there are no reinvested dividends.
Some libraries have wall st journal on microfilm or other media and you can look up the price at that time.
Consult your librarian.
OR
take an educated guess based on google search or your father's recollection.
you have to adjust quoted prices for splits.
SInce you didn't mention it, that would imply there were no splits.
@flyerii
