My Dad's Mom was born to Norwegian-American parents, so this was a very nice find! My Dad was at the show with me and I had to run it over to show him after I bought it.I didn’t know that, very interesting, never seen one at the local (tiny) militaria fair here in Norway. This version seems to have been used from 1888-1894. A taller version, similar to the earlier German Pickelhaube, apparently used from 1845-1855.
Thanks for sharing