The "Federal Law Prohibits reuse blah blah blah" was required from 1932-1964 so one bottle predates '64 and one is after. You can date the Park and Tilford from 1965-1978, look on the bottom and see if there is a 2 digit# corresponding to a year between those 2 and you may have a more defined date. For the one from 32-64 do the same and it may give you a more definitive date
They both have "Federal Law Prohibits....." but I have not had time to check out all the numbers on the bottom of the bottles. Thanks for the help!!