CANADA. Ontario Bank. Sheet of 10 Dollars, 1888. Front and Back Specimen.One front and one back proof sheet of this 1888 10 Dollar Ontario Bank design. 4 Proofs on each sheet. This is only the second time we have handled this proof, but that was just a face proof ridden with annotations. These interesting sheets are uncirculated with deckled edges at left likely from being removed from a book.