Mike McClung had these for sale last week, and on Easter Sunday, at my father-in-law's senior apartment, I won both of these for about $30 apiece.
They aren't perfect, but they ARE both #64 on cover, and really pretty pink.
1st one is dated 10/10/1861, looks like from Buffalo, and Mike described as "true pink" great color, and to me, the stamp looks like the paper is toning, maybe a little yellowish:

Stamp only:

Next one, not dated, but faintly can make out that it is from Urbana, OH, on the back of the cover he describes as "pastel pink" which is not one of the "official" shades, but would be the first variety I have of pink:

Stamp only:

Enjoy-- Ray