The fact that this surplus dealer "Elektronik Lowprice" is listing "db" (Doerrbeck) as a Dubilier cap is not proof listed cap is MKT from Dubilier, it is only proof that these people understand it that way. Cornell Dubilier film caps look different.
You may want to compare a different dealer offer :
https://www.balzer-cfs.com/listing/manufacturer/sSupplier/24934
You may want to compare a different dealer offer :
https://www.balzer-cfs.com/listing/manufacturer/sSupplier/24934