Does this help?
I haven't had a chance to create a public Milsurp Knowledge Libraryentry for it yet, but my 1904/39 Portuguese "Vergueiro" Model 937/M39 Mauser (click here) is marked with the same crest.
It's manufactured by Deutsche Waffen und Munitions Fabriken, Berlin.
(Click PIC to Enlarge)
Here's a neat bit of trivia....
It's all matching except for bolt safety, c/w matching bayonet and original sling"
Why is bolt safety the only mismatched part?
"The complex nature of the M1904 Bolt and its difficult striping and reassembly process conducive to the loss of parts, contributed significantly to the demise of this Rifle as a Service Arm with the Union of South Africa, Defence Force. UDF Troops are documented as arriving on Parade with disassembled Bolts and their parts tied in a handkerchief and many surviving Rifles today are found with replacement Bolts, or the Safety flag having been replaced, as was easily lost. Today, many M1904 owners rather do not strip the Bolt assembly, or, hand this job to a competent Gunsmith."
Here's an older thread from 2011 started by Advisory Panelmember dopter where he included a Vergueiro Portuguese Mauser Bolt Disassemble and Re-assembly Video.
Vergueiro Portuguese Mauser Bolt Disassemble and Re-assembly Video
Regards,
Doug