Your stamp is not print 1, pos. 51 but print 2, pos. 21 (the perforation KI, 1st row fits for both).
For comparison please have a look at the following scan, showing both stamps (from the fullsheets at the Post & Tele Museum Danmark).
Please note, that the grey dot under the feathers in NV on your stamp is not placed exactly at the same position as on RF.5.51, and that the placement of the oval and the course of the oval-line fit perfectly with 25ø2 pos. 21.
Mange hilsener! Bernd
- 25o1-51-25o2-21
- 25o1-51-25o2-21.jpg-for-web-xlarge.jpg (74.69 KiB) Vist 1882 gange