H E L P - Please. British Markings on a WW-I Luger

I agree with Johnny, I had a similar Brithish proofed WWI Luger at one time that was purchased in England by a US Serviceman around 1955 and brought to the US. The pistol was in near mint condition inside and out with the exception that is had been "painted" with the British Military finish. I can only speculate that particular was used or held in reserve by the British Government at some point in it's life.