I have a ton of these. They are priced in the scott specialty catalog usa, might be a copy at your local library.
I collected full sheets and made singles display for my stamp wall from 1909 to 1960. I also have some 1970s-1990s
I have some on cards 1909,10,11,12 seal tied to by postmark.
If you find wx11 type 1 it has catalog value $1400.00
wx2 type II is catalog value $6400.00
I notice some of the newer as you have they value in blocks of four some $0.50 or so. Your 1966 block of 8 $0.65 scott 2013 edition.
Your 1932 single .20 to .50cents.
Your 1940 single .25cents.
Your 1950 single .25cents.
Your 1960 single .35cents.
I like to browse
ebay they have a lot of countrys that have issued xmas seals and I like the colors, and pictures and intend to collect some of those.
There is a xmas seal APS society, I emailed the founders son once, very cool, he listed some prices.
I have not given a lot of detail here not at my finger tips at the moment but easy to find info on your xmas seals and yes they have value and a lot of people collect them.


