The item that started this thread does indeed look as if it could be from the 19th century. It can be bit of a minefield Native American stuff "I have learned at my cost" but it is out there. Perhaps you are lucky. Much like the British Museum which has massive totem poles in its atrium. Picked from the source just at the time, late 19th century when the use of local art was at its most weak in a cultural sense.
This will sound a rather "erich von daniken" but I am begining to believe that iron work was happening in the Pacific North West well before official Western/European/USA contact.