$4.00 Bank Commerce 1870 note

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Good morning.
I am writing a television documentary 'Gathering Dust' based upon collectibles and recently discovered heirlooms etc. and seek your advice on the following Canadian Bank note for accuracy.
The note carries an image of a seated  elderly lady to the left teaching little girl to knit. A bee hive I beleive it is, to right.

Features:

Bank of Commerce.
July 1. 1870
Four Dollar TORONTO
Signed illeg. bottom left but Mc Master to the right. Numbered 073460

If any of you can assist with any sound information and accurate comment on this item, I would be endebted to you. Please feel free to e mail me directly.

Many thanks for your time.
David

We have a resident Bank of Commerce specialist on this forum.  Bob, whom can pretty well tell you everything you need to know about this note.  He is a very busy man at the moment, but when he pokes his head in here and replies, I am sure you will be very satisfied with his remarks.

Tom