I noticed it while trying to plate this 25 øre stamp. From the cancellation date (3-2-1875) and colors it must be from printing 1. Looking at the perforations, I concluded it was from the second column (machine K1). Working with the whole sheet and TOFdata, I quickly ruled out any described OF and RF. Looking closely at the stamps without RF or OF I was drawn to the 'grums i rammen i SV hjørne' in position 22. Looking for it in pos 22 showed that it was actually present in the first printing of many other øre values as indicated above. I did not see it in any of the skilling values but here there are only a limited number of whole sheets to work with.
Comments in English or Danish are welcome.
Thank you very much for your interesting contribution!
But - it's no surprise, that the RF ("grums i SV-hjørne") is not visible in 50ø1,
as this was printed with the B-plate of setting 5!
So position 22 in this print has actually the frame-cliché 5.122 and not 5.22.
Mange hilsener! Bernd