Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - 1924, Laurentide Air Service Ltd, intact booklet containing four panes of two stamps of 25c in dark (top) or light red, each one is rouletted at top, minor scratch of cover at right, stamps are flawless, mainly VF and rare, Unitrade C.v. CAD$3,300 as four never hinged panes, Est. $1,200- $1,500, Scott #CL4b