Just looking through Ed Tinkers "Police Lugers" book, there is a luger on pager 275 with this exact starburst on the barrel.
The page commenting on this symbol states that this symbol is found on many Third Reich weapons besides P08's. Speculation that this symbol is a hardness test mark is unsubstantiated.
But looking at the pictures here on this thread and the one in the book, they are exactly the same. The one in the book is a 1940 mauser used by the police in the soviet occupied sector of berlin after WWII.
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