A link recently came through on my eBay feed offering for sale for $80 or best offer, an allegedly original Supremes Concert Handbill from 10/15/1965.

https://www.ebay.com/itm/mint-ORIGIN...4383.l4275.c10

I was wondering how a buyer of something such as this can differentiate between an original and a reproduction? I know in the past I have seen
nearly perfect reproductions. I am not saying this is a reproduction, but
is there any definitive way to tell if a handbill is actually a reproduction?