In my opinion the spoon is Danish and made about 1800. The reason why I think so is the double-stricken maker's mark CI. I can't find a perfect match, the incuse on the right side of the mark is a bit annoying.
I would suggest Casper Johannsen in TÃ¸nder, born in 1740, master in 1781. He died in 1826.
I am not at all sure about the maker, but the spoon is either Danish or Norwegian.
Hope this helps,