after wrigley died in april of 1977, the team wore black armbands on their left sleeves as a memorial. here's rick reuschel's card, number 50 in the 1978 topps set.
anyway, this memorial is one of three in the 1978 set, and the first that i noticed as a young card collector. i didn't know for whom the armband was being worn, though, because there was a lack of readily available information. my, how times have changed.