It is a DWM acceptance stamp found primarily on military Lugers. Does the serial number of the breechblock match the remainder of the gun? If it does, there is the possiblility that this was a left over breechblock from the military test series production.
Coincidently, my 1906 American Eagle 9mm is less than 40 numbers away from yours (#28866). My breechblock does not have the Crown/Eagle marking. To have two guns so close together, one in the USA and one in Belgium is remarkable!
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If it's made after 1918...it's a reproduction
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