Sam Etcheverry Autographed Card (Canadian Football)

Hi there,

I volunteer at a charity shop that receives donations.  We received this autographed Sam Etcheverry card the other day and can't seem to find anything to help us price it.

Sam was a professional Canadian and American football player and head coach, most famously with the Montreal Alouettes, in the 1950s and 1960s.  

I've seen some football cards on ebay, the most expensive being around $300.  But, I can't find any cards like this or any autographs.

Any help would be greatly appreciated!

Thanks so much,

Erin