WW2 Luftwaffe pistols?

[Flying10uk]

No, the "D" and "A" at each side of the cross swords presumably stands for "Deactivated" and the "11" at the bottom, I assume, is an abbreviation for the year 2011. The cross swords I assume indicate the Birmingham Proof House who checked the deactivation in this instance, before marking the main components and issuing a deactivation certificate to prove that it has been legally deactivated and checked by a proof house. The London Proof House who also do this work have a different mark to differentiate themselves from the Birmingham Proof House.