Tom that is very nice pieces of narwhal, usually the "twist" doesn't have such deep groves as the bear does.
The only narwhal with a flat plate that I have ever seen have came from Rick Bowles.
I wish that I had talked to him 1st about the ones that I did.
I would be curious to know how close the diameter of the bear is to the shop required size on CW.
Most of Jim's narwhal came from Dave Loomis & Doug Cream.
The flat butt plate saves on grinding the handle down like a cap does.