Missing Colour Denmark Royal Emblem 1879 With Value 5 Ore

Dear Friends,

I wish to share with you these images of Royal Emblem 5 ore with missing in centre blue colour.

Please if anyone can contribute some thoughts about it?

Regards

Otto

Dear Friends and Collectors,

Here are a few sharped pictures. I hope it will help to identify this colourless stamp.

Is it forgery or fake?









Regards

Otto

Otto,
TIP: try and learn to crop your images.
The black background is an improvement, but we don't need 5 images of the same thing, accurate images help us to help you.

Opinion:
Looks to me like a "colour changeling" albeit, I have never seen a stamp go from blue to bistre.
Usually depending on the pigments blue to purplish.

There would be no need for a forger to do such a thing.

There has been Light or chemical damage (soaking etc)