A very nice Bank of Montreal $100 1923 note (Sheet # 010423, Plate D) will be auctioned on May 02, 2009 by All Nations Stamp & Coin in Vancouver, BC. The current bid is $3,400.00. It's described as being a Choice EF (see scan). Since I'm out of town I cannot check whether this is a previously unrecorded note or not.
{http://img.villagephotos.com/p/2008-1/1293040/104a.jpg}
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" Buy the very best notes that you can afford and keep them for at least 10 years. " (Richard D. Lockwood, private communication, 1978).