In 1938 the Bank widened the signature panel on the $1 by 2.4 millimetres to cure a printing problem, and the Canadian Bank Note Company then destroyed every die, roll and plate used for the original face. The record kept both counts: 10,000,000 narrow-panel notes against 460,000,000 wide - the largest printage figure anywhere in this catalog - which is why both versions hold their own pages here rather than sharing one.
A forty-six-to-one ratio does the pricing arithmetic on its own, and the destroyed tooling closes the question of later printings permanently. The narrow panel is the affordable variety hunt of the series: common enough to find, scarce enough to matter, and identifiable from a decent photograph.
Measure, do not squint. The difference is 2.4 millimetres in the panel around the signatures, and the reliable tell is comparison against a known wide-panel note side by side. Certified attribution removes the argument for the money grades.
Mintage figures: United States Mint (Annual Report of the Director of the Mint), Royal Canadian Mint records, and — for the 1935 banknote issue — Bank of Canada printage records as published in the Charlton Standard Catalogue of Canadian Government Paper Money, cross-checked across independent published references. Specifications: United States Mint coin specifications.