Nice plate. In the upper left, if a manufacturer code, GUZ ties to: Ruhrstaler Gesenkschmiederei, F.W. Wengeler K.G., Herbede/Westf. I believe Ruhrstaler Gesenkschmiederei translates to ~ Ruhr Valley Forging. This company, which has roots extending back to the early part of the 20th century, still exists:
http://www.ruhrtaler.de/en/cms/websi...=/de/index.php
The plate shows two Ersatzteilnummer: W8-190.354-45208 and 8-190.354-0811.
The W prefix in the first number indicates Werkzeug, which relates to a tool used to produce a part. For both numbers, the leading 8 designates airframe, and as Ed stated, 354 relates to the Baugruppe, with the leading 3 indicating Konstruktionsgruppe 3 for Leitwerk or tail unit.
I believe that ENDRIPPE translates to end rib.
So it's possibly a plate that marked a tool (with the work number W8-190.354-45208) used/made by Ruhrstaler Gesenkschmiederei to form a rib component for the Fw190 tail assembly, the resulting part having the number 8-190.354-0811.
What does the Fw190 parts manual show?