I don't think thats a Mac part at all. / EuroDIN connectors / were/are used for a lot of purposes which have nothing to do with Macs.
On the other hand, "apfel"
is German for "apple". :?:
doesn't appear to have a chipset or really any other circuitry
You can see a couple of chip-like objects peeking out from under the foam on the back. LimeiBook86, any chance you could post a pic, preferably a scan, of the rear of the card with the foam removed?
that is
one strange lookin' lil' critter! 
Yeah you got that right.
