Interesting error

[sinmore]

I apologize in advance if I'm posting in the wrong section but it seemed the best choice. I'm very new in the trading card collecting community but I did come across a large collection of sports cards that I was looking through to see if anything worth while was there. I think I found something interesting and would like to know more about since after extensive searching online I am unable to find any info, which brought me here. Its a 1989/1990 Pro Set Chris Miller #12/35. It seems to have the front of a 1989 card with the back being 1990. Anyone seen this type of error before?

[michigandan]

Very interesting, can't seem to find an info on it either! Hopefully someone will chime in with some help.

[pwaldo]

One of the coolest errors I've ever seen posted on here. Clearly the card couldn't have been made in 1989 with a 1990 card on it so it was made in 1990 and accidentally mixed with a 1989 card. I don't have much knowledge about these sets or if there are any other errors like this but this guy will know:

https://junkwaxgems.wordpress.com/

He's the most knowledgeable guy on the internet about these sets and errors. If anybody will know he would.