Looking for info on fuel injectors DV0399

I'm trying to find info on fuel injectors. I have a pair of what I believe ar early 911 injectors. They have "Germany" and the part number DV0399 on them. I would say that they are rebuilt, but how do you tell for sure? Did a google search, but didn't find anything on them. Can anyone here point me in the right direction? Thank you.

Well the only two styles that would pertain to a early 911 would
be a MFI injector which would thread into the head and a CIS
Injector that is held in with a o-ring post a picture......

Here is what I have. The one on the left is a DV0460 which from my research is for 911 RSR 2.8L the right one is the DV0399.