Here is a Genuine Mercedes-Benz Ignition Barrel/Tumbler w/ Key.
MB Part#: 1264620379
This should fit various W126 models from 1981-91 such as 560SEL, 420SEL, 300SD, 380SE, 380SEL, 560SEC, 380SEC, etc.
It looks almost new but does show some age. I don't know if it was ever used.
It might fit the years and models listed in the title but I can not guarantee it so please compare part#'s and research it for yourself before buying.
It is the buyers responsibility to check interchange years and match part #'s before buying.
This is part of a large lot of parts that was acquired from a service center.
Sold as is. No returns unless the part is not as described and pictured.