Publisher: Boy’s Life

Country: USA

Date: November 1972

Derailleur brand: Shimano

Derailleur: Shimano Eagle of some sort!

After adopting it in 1970, Sears continued to use the Shimano Eagle in 1971 and, as shown here, in 1972.

If you click on the area within the dotted lines you can see an expanded picture of the derailleur.