This is the only Katzer coat of arms we have found.

The lineage of the Kaczér (Hungarian spelling of Katzer) v. Lak, for whom this coat of arms has been created, has died out.

There was a certain Georg of that name in AD 1500, who used it.

In "Die geschichten der Ungern und ihrer landsassen" by I. A. Fessler (published in 1822) a certain Andreas Kaczer v. Lak is mentioned in the list of Hungarian 'magnates and state officials (see bottom of page 820):

Die geschichten der Ungern und ihrer landsassen By I. A. Fessler

We thank Jacek Katzer for calling our attention to that website.