The 1937 $20 (Osborne-Towers) Bank of Canada Note was printed for the Bank of Canada with a recorded printage of 1,622,000 notes — the 6th-lowest of the 23 notes of the issue in the 1937 canadian banknote series, and less than half of one percent of the 1,626,969,500 notes in the whole 1937 issue.
Princess Elizabeth again, aged eight, carried over from 1935 - the future Queen under the short-lived Osborne signature.
A full collector's note for this issue — survival, strike character, and what to check before buying — is on the writing schedule; the figures above are the permanent record.
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.