I have a postcard that was sent to Richard Otto with the Deutsches Reich 10 red color stamp. The content is written in German if I am not wrong. This is dated as 19.3.12 11-12V. Breslau. The other side, it's a photo of people reading something with a text that says "herzlichen glückwunsch zum geburtstage".
Sample stamp pic is attached. Can you please guide me?
Can you please help me

Thanks much!