"Vintage" from 1986.
I can't decide if I should laugh at the idea that this seller thinks a My Pet Monster doll is in any way worth 600 dollars. Or cry because my childhood is now considered "vintage". (I was 10 in 1986)
It comes with two sets of cuffs and we've not even seen the puppet yet so I'm still on the fence.
40yrs is vintage afaiu, dude's been waiting 40yrs to post this ad.
Sorry to break the news, but you have been vintage for over a decade now.