Newfoundland 1931 $1 Airmail Cover St. John’s to Denmark & Returned

Cover franked with $1.00 blue, tied by St. John's slogan cancel (Jul 30), to Copenhagen, Denmark, with c.d.s. receivers (10.9.31) struck on front and back, multiple instructional markings, rose Danish return label on front, and French Ottawa DLO b/s (SP 30), some edge creasing as expected, unusual and fine.