Duncan DD question - how old is this one?

[Fab83]

Hey guys,

been new to the forum and want to say hello to everybody!
Got an offer for a Duncan DD but don´t know if it´s real Duncan pickup or not since it only has DD written on the back. No stamp on the bobbins or the baseplate.
Here´s a link to the pic: http://imageshack.us/a/img199/6112/00sddd.jpg

Thanks in advance?

Fab