I am thinking these three silver dollars were already toned prior to inclusion in this holder

TallahasseeCoinClub

What say you? I know.... pics are not so great.

jmlanzaf

How would anyone know for sure?

I think it is unlikely that they were toned so similarly before put in that holder.

pcgsregistrycollector

Peace looks AT

MsMorrisine

attractive set

Typekat

Very nice -the colors look natural to me.
Where the set was stored over the years may have caused the tarnish.

Cougar1978

Nice coins.

RobertScotLover

Does it matter

JimTyler

I don’t think capital holders tone anything