What Can You Tell Me About These R13

I found several colors of R13 in a collection. In Scott the price differences are huge between R13c, R13d and R13e. Can you help me? What are the characteristics of Silk Paper compared to Normal Paper?

These are all R13c.

An excellent resource for the ultramarine shade and silk papers on the first issue revenues is https://revenue-collector.com/sitemap.shtml.

The period at the end of Ron's sentence above munges the URL.

Here is the link to the silk papers reference: https://revenue-collector.com/1stis...papers.shtml

Regarding the colors of R13, they are the same as those listed for R97, even though the milky blue shade of R13 does not get its own listing in Scott (I believe it should).

The regular blue and milky blue occur at approximately a 70:30 ratio. It's only the ultramarine (R13e) that is quite scarce.

The three R13 colors side by side (from left to right: ultramarine, milky blue, blue):

Thank you for your response. It helped me a lot.