Easiest is to look up the coin in the Numista database:
N#1440
And on the site of NGC:
https://www.ngccoin.com/price-guide/world/norway-krone-km-385-1925-1951-cuid-1084582-duid-1435166
For ordinary world coins, that will give some idea.
In order to get the grade right, just depart from the rule that a circulated coin is VF grade. If there are significant signs of wear and some details are worn of completely, then grade will be F or lower. If the coin is unspoiled, and has at least some of its original luster, then it is XF.
I'd give your coin a VF. Both sources give $0.70-0.80 for VF, but if you want to sell, I guess it'l make less, as it is a fairly common coin.
