David, most of the collectors I have read have stated that this is a DWM stamp and NOT a US Ordanance stamping.
See here for a US Ordnance stamping:
http://www.lugerforum.com/techinfo.html
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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