Aluminum Bat on a Major League Baseball Card?

[Georj]

231008 Why Is Bruce Boisclair holding an alumin baseball bat on his 1979 Topps card #148?

[Zach Wheat]

H & B started to produce aluminum bats in 1979....

Z

[savedfrommyspokes]

Gene prefers the aluminum over the wood too.....maybe the Easton was used as some sort of fungo bat??