Bank of Commerce proofs

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I have a few Canadian Bank of Commerce proofs from 1917. I was curios if anybody had an idea on the value. The $20 only has the face proof.

{http://img69.imageshack.us/img69/1963/curr25.jpg:http://img69.imageshack.us/img69/1963/curr25.th.jpg}

{http://img62.imageshack.us/img62/3714/curr26.jpg:http://img62.imageshack.us/img62/3714/curr26.th.jpg}