Newfoundland C16a, 17a Postage Due and Officially Sealed an unusual postmarked airmail stamp

an unusual postmarked airmail stamp – the first we recall seeing with what we can describe as a mute double oval intaglio cancellation in black

affixed at foot of envelope showing Winnipeg 8:30 PM AUG 17 1928 arrival postmark above as do most of the few known covers

Never Hinged(Unitrade 216i

printed frank in black U

quite well centered with full original gum

Newfoundland C16a, 17a Postage Due and Officially Sealed an unusual postmarked airmail stamp1933 Sixty cent green & Seventy five cent bistre Labrador, matching mint imperforate pairs with sheet margin at left, large margins on other sides, full original gum, Very Fine, Lightly Hinged (Unitrade C16a, C17a; catalogue value $1,800)