What you are referring to is called a "chop" in English.
From The Free Dictionary-dot-com:
Quote:chop
n.
1. An official stamp or permit in the Far East.
2.
a. A mark stamped on goods or coins to indicate their identity or quality.
b. Quality; class: first chop.
From Dictionary-dot-com:
Quote:chop
noun
1.
an official stamp or seal, or a permit or clearance, especially as formerly used in India and China.
2.
a design, corresponding to a brand or trademark, stamped on goods to indicate their identity or quality.
3.
the signature stamp of an artist, printmaker, etc., testifying to the authenticity of a work.
From Answers-dot-com, quoting Wikipedia:
Quote:Seal (East Asia), or "chop" colloquially, used in China, Japan and other parts of East Asia to prove identity (typically on documents or art in East Asia)
Note the use of the synonym "seal" in that last definition. None of these definitions, however, define the object being used to create the seals impression as a chop. However, when i lived in Korea, the object itself which was used to create the stamp or seal was also called a chop. One might say: "He couldn't sign the document, because he didn't have his chop with him." This is a sufficiently obscure use of the word chop that i have not been able to find a definition online to confirm this for you, but i assure you that the item shown in your images is called a chop.