Both the '73 and '77 sets featured 16 Cubs. Right now I've got 14 of the 16 in each. I've exhausted all of my usual haunts tracking them down. The missing four are nowhere to be found.
So, if you see any Jewel pictures of the following, let me know:
1973 Randy Hundley
1973 Ron Santo
1977 Jerry Morales
1977 Bruce Sutter
Thanks for keeping an eye out.
For now I have to settle for virtual copies, compliments of the Trading Card Database