Greetings Everyone! New to the forum, now that I'm retired...I guess I have time to mess around on these things now. I came across a 5 and 10 Greenland Kroner (P-15 and P-16) Awesome condition. The have an actual mailing address stamped on the center to the North Pole. Known as Fletcher Island (Ice Island), T-3. The stamp indicates the date my grandfather landed his DC-3 there to pick-up / drop-off supplies. I know these bills are pretty rare and can draw a few hundred in good condition...will the address stamp decrease or increase the value?