Costanzo is a pretty advanced place to start.
German Small Arms Markings is a great introduction to thte basics. It will lead you to Noll's Imperial German Regimental Markings, Maus's History Writ In Steel, and Walter's book, along with several others, as the direction of your interest evolves.
This will bring you back around to Costanzo, at which time you will have a much greater understanding of his book.
--Dwight
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