Stamps On Stamps

Armenia
100th Anniversary of the first postage stamp of Armenia
November 11, 2019
The stamp shows a 1919 hand surcharged stamp.

Czech Republic
Prestige Philatelic Club Prague
September 23, 2020
The stamp set shows a 50/50 Doplatit stamp (1927) and an Austrian Red Mercury stamp (1856).

Germany
Stamp Day
September 2, 2021
The stamp depicts The Bordeaux Cover of Mauritius which is franked by two Mauritius 1847 Queen Victoria stamps.

Malta
100th Anniversary of Malta Senate and Legislative Assembly
November 1, 2021
The stamp depicts one of the SELF GOVERNMENT overprint stamps issued in 1922.

Slovenia
75th anniversary of the first Slovene postage stamp issue for the Slovene Littoral and Istria
July 13, 2020
The stamp shows an 1.50L definitive stamp issued in 1945.

Botswana
Postage Stamp Centenary
July 24, 1985
The stamp set features three Bechuanaland Stamps.
7t: Cape of Good Hope stamp overprinted (1885)
15t: Queen Victoria Jubilee stamp overprinted (1897)
25t: King George V and Landscape (1932)

Hungary
Tourism - Budapest
May 25, 2005
Set of five, one stamp shows a rare 5000 korona Madonna and Child inverted stamp issued in 1923.

Norway
150 Years of Norwegian Postage Stamps
November 17, 2005
The design includes an image of the 4 skilling Coat of Arms stamp issued in 1855.

Italy
Montecitorio Philatelic Exhibition
February 9, 2006
The stamp shows a group of early Italian postage stamps.

Kuol - I've been curious as to how many different topics you collect?

Cyprus
Cyprus Stamp Centenary
March 17, 1980
The minisheet shows six English stamps overprinted CYPRUS issued in 1880.

Turkey
50 Years of Europa stamps
December 15, 2005
The stamps in the souvenir sheet feature EUROPA stamps issued in 1960, 1963, 1971, and 1973.

Colombia 1979

Airmail - The 100th Anniversary of the Death of Sir Rowland Hill.

In 1999, Spain issued a sheet contains 12 stamps entitled "The Stamp - inseparable companion" aimed to promote philately and stamp collecting. All stamps show a stamp image (which SOS collectors call pseudo-stamp):

Two of the stamps show real stamps. The first shows a birthday celebration cake made of the first stamp issued by Spain in 1850, to celebrate the 150th anniversary of Spanish philately:

Second stamp shows Spanish stamp issued in 1967 depicts cave painting from Morella cave:

Here is the original stamp:

To publicize the PHILEAFRIQUE '79 stamp exhibition held in Libreville, Gabon and Essen 78 stamp exhibition, two stamps designed by Pierrette Lambert were issued by Rwanda on November 1, 1978.

Great Spotted Woodpecker (Dendrocopos major) and stamp of Oldenburg from 1858:

Greater kudu (Tragelaphus strepsiceros) and a stamp of Rwanda from 1967:

The original Rwanda stamp shows Red Bishop (Euplectes orix) bird: