I'm also skeptical about a pre-contact age on that club.  However, I think it came from the south Pacific, not the Pacific Northwest.  
 
Here's my reasoning: 
 
1.  Pre-Contact vs. Post-Contact: The carving looks like it was done with metal tools.  Granted, I haven't done any carving on whale bone (for the obvious reason of not having any), but Pre-Contact lines would have been ground and chipped in with stone tools.  This tends to make for round bottoms and smooth edges.  If you can imagine free-handing those circular incisions using (perhaps) a stick and some sand, or an awl made from something, then you'll see what the issue is.  With a metal drill, it's a trivial figure to make.  Ditto with the edges around the mouth.  Now, if you can see work marks that makes you think someone laboriously incised all that stuff, then Pre-Contact looks more likely. 
 
2.  South Pacific vs. North Pacific: to me, it looks like Polynesian work.  My thought is that in the early days, a number of Polynesians, including Maori, served on the whaling boats.  I could see such a sailor making this club on-board or afterward, using some bone from one of their catches. 
 
That's my 0.0002 pence, 
 
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