The "ding" is a British proof mark. The circle around the letter indicates that it is a foreign made firearm. British made firearms do not have the circle.
In the photo it looks like it also has a vertical Crown/N proof on the left side of the receiver, and possibly some additional proofs on the right side of the barrel just forward of the receiver.
The grip marking is for the Landj�¤gerei (rural constabulary) L�¼neburg weapon number 136.
To me, it looks like a Weimar era police Luger fabricated from parts, that possibly has seen WWII military use (Wa66 might indicate an arsenal repair, but that era is not well known to me), and eventually was taken to the UK where it received the mandatory proofs and "Not English Make" markings.
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If it's made after 1918...it's a reproduction
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