OK folks, I've gone through the first 40 pages of this thread last night and tonight, and will probably go through all of it for a great education at some point, but I bought a small lot on
ebay, and for what I paid, and what I already could use for my Big Blue, it was a good buy for me.
There was a page of "extras", and I've been able to find some references to these on earlier pages, but a few I haven't found yet:
Found these:

Looks like these are Postal Tax stamps not listed in Scott from '23 & '26
I think the first one here is on this 110th page of the thread, and I've seen others like the 2nd one mentioned as revenues, but I haven't seen the third one anywhere in the first 40 pages of the thread:

BTW, I sure wish the 1st one had an overprint!!! Is there any value to the revenue (original version?)
These are A22-A26 Turkey in Asia, but I haven't found this overprint in Scott, and haven't seen it in the earlier pages. Any ideas?

Then I figured that these were Airmails, but it looks like Rod made a page for the examples he found-- 1937 Aviation Defense unlisted in Scott:

I'll probably list these on HipStamp....if anyone could help me with ID's and approximate CV, that'd be great.
OR, if anyone wants them at 15% of CV and free shipping, let me know and I'll make that happen.....
Thanks, Ray Appreciate your help!