Lot 379 Canada 39c-42c Multicoloured Shearwater Air Show & UN Observer 1990-1995, 12 Souvenir Covers Franked With Commemoratives, 4 Being Signed By The Pilots, Est Value $15

A group of 12 souvenir covers for the Shearwater Air Show (an annual air show) and the UN Observer Group in Central America, franked with singles. Generally all VF. Four are signed by the pilots and all appear to have been catalogued using a specialized numbering system and valued at over $60. I don't know which catalogue these numbers are from, but my estimate of the value is $15.