Hi Cerjak,
I think I finally found what you were looking for: the Tojhusmuseet Copenhagen indentifies your Christian 7 flintlock musket as the Danish model m. 177
4, no. 569, the third from the top in my scans.
It seems to be the very first Danish model to feature four ramrod pipes.
I knew it was somewhere in my library, and the scans are taken from Claude Blair,
European and American Arms, 1962 and still on top!
You were pretty close in guessing the correct year of this model so.
Best,
Michael