Pete, welcome to the forum, but I am unsure what the marking is, it could be about 3 different markings.
The crown N is the commercial acceptance markings usually seen, the marking above could be a suffix letter or it could be an overstamp of something.
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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