Belgium Parcel Post

OK while rummaging through a pound of stamps recently I found these rather curious stamps. There is no country of origin that I could find which sort of points to England/Brittan but the cancellations seem German/Austrian but honestly, I really have no earthly idea? anyone recognize these? Thank you very much for your time and for any leads or information you can provide. -Jeff


EDIT: added larger image (possibly temporary) (Too see it MUCH larger click on image and then on photo bucket click on the magnifying glass in lower right of image.)