NORTHERN AIR SERVICE. SEMI-OFFICIAL AIRMAILS: NORTHERN AIR SERVICE: CL5: 25¢ blue, two covers, one on front of 3¢ stationery tied by ROUYN LAKE 17 AU 25 cds and HAILEYBURY same day receiver, other with 3¢ red Admiral tied by ROUYN LAKE 27 JUL 25 cds on front and tied by same date and purple straight line FIRST FLIGHT on reverse with HAILEYBURY same day receiver, f-vf (Image)

Cat. Val. 350.00

NORTHERN AIR SERVICE. SEMI-OFFICIAL AIRMAILS: NORTHERN AIR SERVICE: CL5: 25¢ blue, with 3¢ red Admiral tied by ROUYN LAKE 27 JUL 25 cds on front and tied by same date and on reverse, signed by Pilot. very fine (Image)

Cat. Val. 175.00