To narrow things down or perhaps add confusion, in Don Maus's book, 'History Writ in Steel German Police Markings 1900-1936' under the heading of New Insights,
"d. Recent information from Klaus Merzbach has confirmed that S.D.IV was Duisburg-Hamborn."
Don believed that the Type 3 markings S.D. I, II, III, IV and V represented the large Schupo commands in Essen, Wuppertal, Düsseldorf, Duisburg-Hamborn and Oberhausen, respectively.
The Duisburg-Hamborn district is merely 35.3 km north of the Düsseldorf district however.
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