Opinions Wanted: Silk Papers Or Not? (Large Images!)

I'm taking both of these to Chicagopex to have Eric and Richard look at these before spending the money to send to the PF. Just based on catalog values and scarcity, the odds are against them, but these have the correct color, and impression. They're the best candidates for R48d I've seen to date.

Pencil notations are not mine. USB microscope closeups after each stamp.

First stamp. Also has a doubled bottom frame line.










Second stamp.

The first is not. Dirty paper, only one tiny fiber which is not the correct shape. I am not inclined to like the second because the fibers are all so small, but I would have to see that one in person.

Can you find anything on the front of the second stamp? Seems like you should be able to on that one.

The only thing I found was a shadow of a possible thread near the left margin, but no actual threads. They are very small, the scan makes them seem larger then they are.

the first is imo not silk paper. size and shape are wrong. can you tell the date in the second stamp

I should have taken the time to run the first image through retroreveal before posting. While I can't make out the last numeral, the first digit in the year is definitely a 6, which precludes it being a silk paper.

March 19/6?

Might be 67. Which makes it impossible to be silk, as you said.

This is the only copy I recall selling, From the Myron Correts sale in 2016.