$8,000 + for both. The 1972 ball alone is worth between about $5,000 and $6,000. You might be able to get more or less depending on the condition of the ball. Get a certificate of authenticity to assure top dollar because someone buying those balls will want one. I will give you a jumping off point if you are interested in getting a certificate of authenticity.

http://www.paasautographs.com/certificateofauthenticity.html

http://www.footballwarehouse.com.au/Products/10_Miami_Dolphins_1972_team_signed_football__rare__w_.html