Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE

Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE
Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE

Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE
Only 3 known covers according to sources. Otherwise, VERY FINE in all respects. The item "Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE" is in sale since Sunday, July 6, 2014. This item is in the category "Stamps\Europe\Switzerland". The seller is "frumi" and is located in Hawk Point, Missouri. This item can be shipped worldwide.
Switzerland 1926 Airmail Basel Muster Flight with engravers mark vignette RARE