I didn't think it was very valuable either, but I listed four of these similar style covers with the similar cachet I acquired in a collection and sold them on
ebay for $10 each in less than 8 hours after listing them. I am being asked if I have more. I ask why they're valuable and I don't get a straight answer.
With the same collection I went to a stamp show and met a cover dealer ( I will not name them) and they were so interested they asked if they could go through a box and take them to appraise them. They were reputable so in my error I let them. A few days later I was told that he had sold some and was handed $500. I asked for the collection back and they asked if they could buy a select bundle they had set aside for $250. I declined and left. I have many more boxes than what they were allowed to take. So now I am on a mission to understand what it is I have.
I believe this cachet designer is unique, but I don't know who it is. I do not believe it is listed in any catalog also because the dealer I met said something about that.
If there is a truly trustworthy person I can talk to and is willing to give me honest information that would be great. It seems from my limited experience that dealers do not want to divulge the true value while they steal your collection.
Sorry for the rambling, but I'm looking for information. I hope to use this site to learn more about what I have. I will post more images for all to enjoy and comment.