The Glärnisch is a 2'915 m high mountain in the Glarus Alps. It is overlooking the Glarus municipality (477 metres) about 2'438 metres. At a clear day the mountain massif forms also an imposing backdrop of the lake Zürich area.
The massif consists of several summits of which the highest, unnamed peak is 2'915 metres high. Other summits are the Bächistock (2'914 m), the Vrenelisgärtli (2'904 m) and the Ruchen (2'901 m).
Glärnisch massif from the west, viewpoint Herrlisberg at Lake Zürich.
(more Swiss panoramas you can see here)
Switzerland 1923-1925, Airmail stamps.
It seems, that the image of the stamps depicts a view towards the Glänrnisch massif from the West (please see picture above).
The 20 Rp stamp was depicted as stamp on stamp on the special stamp "50th Aerophilately Days", issued 2016.
The 15 Rp. stamp exists surcharged 10 Rp.
The postage stamp is showing a view from lake Klöntal (848 m above sealevel) to minor summits of the Glärnisch massif. The highest peak is not visible on the postage stamp. It is situated more on the left and behind)
Switzerland 2016, "50th Aerophilately Days".
The stamp shows the 20 Rp Airmail stamp, issued 1925 as stamp on stamp.