Lot 305 Great Britain, 1939-1945 Airmail Covers To Canada, All 1/3d Rates Paid With Various Combinations Of Definitives

4 Great Britain airmail covers dated 1939-1945, all 1/3d rates paid with various definitives, including #220, 237, 240, 243, 263 & 248. Based on the perfs the 1.5d appears to be the normal sheet stamp. Generally fine.
Est.is $10-15.