DRP = "Deutsche Reichs Patent," it was indeed made during the Nazi era.
The model 27 name has been around since around WW1 actually, though its design has changed several times. It was one of the world's best-known and best-selling air rifles.
The DRP-era guns have a marvelous adjustable two-stage trigger, a very advanced design for its time.
This photos shows three model 27's, made in 1926, around 1935 (a "DRP"-marked gun like yours), and 1981.
