WW2 Operation Cornflakes

Can anyone tell me how to authenticate this because I know they are very rare?

I would suspect they are bogus because if you are going to use a stamp as Black propaganda you don't date it and tell the world that it was printed by the enemy. If they are propoganda labels why are they spaced so far apart so there is so much waste paper round each label. ENgland was sufficiently short of paper that people were exhorted to use both sides of each sheet and envelopes were reused on official business. I cannot definitely say this sheet is a cheap fake, but I wouldn't touch them with a 10 foot pole.
I hope someone can give you more objective reasons as to it's authenticity or otherwise.

Can't help with the finer details of authentication but this is what I know.

The British forged the Hitler head stamp in 3, 4, 6 and 8 Pfennig values from 1941 until the end of the war, (which for Germany was May of 1945) were better quality than the American forgeries because the British used the actual stamp production facility whereas the Americans did not have the same as paper, ink or the original engravers. The American forgeries also focused on the 12 Pfennig stamp which featured Hitler's skull.

They were supposed to be airdropped in bags bags of addressed mail near bombed mail trains in hopes that they would be picked up and actually delivered. Not sure if it was successful at that or not but it's an interesting piece of history.

Searching our huge database for "Futsches reich" can bring up a large amount of information.

https://goscf.com/t/8094&whichpage=24#631207 br /

These are obvious forgeries of the propaganda stamps. Most obviously, the originals would naturally be perfed and would not be in two colors in order to appear at first glance to be the standard 12pg stamp.

The Michel catalog notes the originals were printed in sheets of 50. Michel also notes the issue was produced in ROME. The printing on the back is a too-small and incorrect imitation of the watermark of genuine stamps.

For genuine propaganda stamps, see PostmasterGS's site:
https://www.germanstamps.net/tr-falsch-us-hitler/

I have all of the Hitler Head Cornflakes stamps that came from a former member of the OSS during WW2 and can say 100% that these are fakes.

revstampman: Can you post photos of them?