Bob,
* Don't forget the WW1 firing pin will be unflutted & was issued with the last 2 digits of the S/N. An Erfurt model will also be Crown/ Letter marked.
* Other internal serial numbered small parts are the trigger(under the side plate) & the hold open bearing the last two digits of the gun S/N.
* Wood bottom mag base on a folded sheet metal, tin colored, single side pinned mag tube. DWM will have the complete S/N with the lower case alpha block letter, if applicable, marked on the base & no proof acceptance stamps. Erfurt will have same + one or two Crown/letter(s). acceptance stamps.
* I've heard no firm consensus on inside side plate numbering for WW1 production. I've seen single digit alpha or numeric inside side plate marks attributed to the Mfg.'s (worker's) interim inspection/acceptance of the individual small part. May see more than one mark, each randomly placed.
* WW1 issued grips were S/N'd and usually had a Crown/letter acceptance IMO.
* Trust this helps.
RockinWR
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