Try asking over at Michigan Gunowners, I don't know if any members are DPD but someone may either have answers or know someone who does.
Several members are from the Metro area
Unless you have questions about Detroit PD markings or provenance, the members here can likely answer most of your other questions. There is nothing particularly magical about a S&W Model 10 revolver.
(Assuming that is the model 10 your are referencing).
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