Mark McGwire was born in 1963, and was 15 years old in 1978. I
can't imagine what item you would have from 1978 related to Mark
McGwire. His first Baseball card was issued in 1985. A Mark McGwire
1985 Topps #401 Baseball Card is worth about $10. -$15. in
near/mint condition.
As your older brother, I've been where you are—maybe not exactly, but close enough.
Chat with Blake
Rene
Change my mind. I dare you.
Chat with Rene
Judy
Simplicity is my specialty.
Chat with Judy
More answers
The fotoball baseballs are more of a novelty, than a
collectible, and are worth about $5.-$10 depending on the player.
If you do a completed listings search on eBay you you could see how
much the Mark McGwire fotoballs are selling for.