Press plate, Druckscheibe, Thrust washer, Rondelle de pression for mercedes limited slip differential or ASD limited slip differential.
This is the friction disk with friction coating and teeth on the inside.
This is an original Mercedes part.
Fits among others:
W123 W124 E class models with the locking differential.
190E W210 with optional barrier or the 2.3 and 2.5 evo models as standard. And all ASD equipped models.