That doll looks way too new to be from 1985. Are you sure that's not a knockoff? There's tons of knockoff Mario dolls.
It's not a knockoff but it's also not from 1985. Those giant goombas were released in Japan in 2005. The tag has the 1985 SMB copyright on it but the other side has the 2005 manufacture date. There is so much SMB series related stuff released in Japan every year since 1985. Either way it's an awesome plush to have.
You are correct, sir! It's from 2005. Which means that it *may* be from around the same time as the nuigurumi Famicom and Disc System plushies that I've been hunting for.