This is a special and rare print on French rag coat acid-free paper created to celebrate several firsts at  the 1983 Indianapolis 500:
It is the first time a father and son raced against each other at Indy, the first Indy 500 Al Unser Jr. raced at, and the first time Galles Racing raced at Indy. 
It is the only print signed by the Driver Al Unser Jr., the Owner Rick Galles, and the Artist Randall Quick.
Only a few prints remain in the collection.