Really nice coin you have there! This is your coin from the catalogue here:
https://en.numista.com/catalogue/pieces110342.html
I can´t set a value to your coin, but another example of your coin with the same minting year was sold for 9600 NOK (about 1200$) on Oslo Myntgalleri´s auction a few months ago. The other example has marks from mounting it to something, but as far as i can tell from your picture, your´s is a bit more worn. Norwegian coins from this period are quite rare, so their value remains quite high, even if these were mounted to something. But of course, the mounting of it lower it´s value significantly.
What is the state of the obverse of the coin? If the mounting of coin has not destroyed the obverse, then your coin is worth quite a lot!
Best regards,
Stavros