Herb,
With regard to rear toggle pin numbering, Jan (directly above) says Imperials numbered only if routed to armory. Mauserlugers (about 6 entries above) says Imperials not originally numbered. So it looks like unnumbered would be normal for your 1916 & 1918. Don't know general case on pin bluing, but my 1918 DWM is blued (and unnumbered).
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