Canada. A Canadian Army Dental Corps Insignia Set, c.1917

Error legend "DS" (Dental Service) Version: Cap Badge in die-stamped pickled copper, unmarked, measuring 42 mm (w) x 43.5 mm (h), both lugs intact; and Collar Tab Pair in die-stamped pickled copper, unmarked, measuring 29.2 mm (w) x 30 mm (h) each, intact lugs. Corrected legend "OS" (Overseas Service) Version: