Yep, 58 mint sets in those old cardboard holders are known for doing that. Most of the coins, not just the dimes, tone up like that or sometimes with rainbows around the perimeters. I pulled this and some others out of a mint set about 15 years ago and got them slabbed.
Comments
It certainly looks like it could have.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
I think so. It reminds me of 1958 mint sets I’ve seen.
TurtleCat Gold Dollars
This one's still in the original holder. A little more red and less gold, but very similar.
Yep, 58 mint sets in those old cardboard holders are known for doing that. Most of the coins, not just the dimes, tone up like that or sometimes with rainbows around the perimeters. I pulled this and some others out of a mint set about 15 years ago and got them slabbed.

Mr_Spud
Looks like it could be... though not one that I would own. Just do not like that ugly tarnish. Cheers, RickO