Czech Republic
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Stamp picture
Click here for higher resolution image
First day of issue: April 29, 2015
Width: 210 mm
Height: 150 mm
Location: Oversize album #9
Stamp ID = 2549

The Czech Republic Post Office calls this a "souvenir sheet". It contains the stamp (a target="_blank" href="/cgi-bin/">czr-20150429-s-001) and the First Day of Issue cancel (a target="_blank" href="/cgi-bin/">czr-20150429-c-001) along with the name of the stamp designer and the method of printing.

From Linn's "Stamp Issuing Entities Of The World" page.

Czech Republic (1993- )
Stamp-issuing status: active; Population: 10,318,958. A republic in central Europe, comprising the Czech portion of the former Czechoslovakia, corresponding to the historic Bohemia.