Can anyone identify this outdoor faucet manufacturer from the mid 70's?
My experience has been that the brass body of the hose bib is almost always sound and that to try to remove it can lead to much more work than you are prepared for.  I think most plumbing or hardware stores will stock all the replacement parts you will need, including a kit to "dress" or smooth out the sealing surface where the washer closes against.  Also, seriously, look for an old guy like me in your neighborhood who has all the parts you'd need, to rebuild several spigots, and would be glad to share.