Jim, I have a few of these types of stamps and that caused me to look into their collectible value and interest. Since I'm no expert on these (nor an expert in any stamp related topic for that matter) don't take me for the last word.
I did spend hours, many hours, researching as best as I could.
Most revenues that are stock tranfers or documentary have minimal monetary value. Enjoyment value, on the other hand, can be high.
Some of the Wine stamps are mid to high in monetary value. Exceptions can be found for all 3 catagories. Snoop around on
ebay in the Book of the book sub catagory and use the search feature. After you post some photos, someone may be able to help with more info.
Marty