Stamp identification

[AndrewK]

I hope I'm putting this in the right place.

I have this stamp which I know nothing about and, after doing a bit of searching on the internet, I can't find any stamped items that match it. Maybe I'm just terrible at this, but I can't really read the writing well as some of the letters look a bit odd to me (and not just because they're backward). The outside of the stamp is marked OBG 4/40.

Can anyone tell me what this stamp is for? Thanks.

[Gerdan]

Here the text on the stamp:

"Postamt Neubiberg über München 8"

http://de.wikipedia.org/wiki/Neubiberg

Gerdan

[AndrewK]

Thank you. So it's from a post office in Neubiberg, I take it?