I am not sure I understand the question fully but the basics:
EWB, "
1920 property marked" and rework (depot markings) are unrelated to one another. They are 3 unrelated markings and all can exist on a rifle independently.
EWB marked rifles often are straight up Imperial in configuration, the rifles were simply supplied to the Bavarian Einwohnerwehr. Which was basically a militia organized to retain order, and it (the Einwohnerwehr) existed throughout Germany, but lasted longer in Bavaria. It was not a Freikorps or police organization and it was not always "conservative" in perspective- generally it took on the nature of where the militia was organized, which as communists were causing so much trouble they were usually conservative. The EWB was eventually disbanded and some of the rifles found their way back into the Reichsheer, but some apparently found their way into hidden caches (
Röhm was an arms smuggler and he was involved with the arming of the EWB). I have owned two EWB never upgraded and seen others.
"
1920" marking is a property marking, and means it was in government hands during the disarming act. It means nothing else, and was used in a short time frame during which the German government tried to disarm the German people of "military" arms, largely due to British and French pressure (Spa conference- or rather the "Spa lecture", as the Germans were rarely involved in discussions, at least before 1925-26, - they were interrogated and lectured at best)
Reworks, - most rifles that stayed in German hands ("1920" property marked rifles and black rifles) were at least upgraded to S/sS patrone compliant, and most to sS patrone (1929 or later). Further many were reworked at the depots, with new Simson barrels, or actually reworked at Simson Suhl (very few). Most rifles that were upgraded were also blued; receivers and bolts, and often the stocks were sanded lightly. There are many differences, some subtle.
Whether just upgraded or fully reworked they should have depot markings, usually at the wrist, but sometimes on the bottom of the buttstock or sides. Very rarely on the buttplate or take down disc (this is either for the parts mfg or the acceptance of the facility that performed the installing, depends how it is marked).
This topic, depot work (whether upgrades, reworks or depot builds) is rather limited in published material, MarkW did some good early work in the KCN, JoeS & I have written on it in the MRJ, but the subject is very diverse.
Be more specific? Have you a rifle in mind? If so describe it.
I have been researching these EWB gewehrs and the rework or reissue under the nazi's, when keeping the standard gew bbl I am under the impression that they were just reissued ( what markings or proofs where are they proofed ) are they still numbered externally with new numbers or the old numbers, the WW1 rifles were in the white recievers and bolts I believe the reissues are blued ?? Steer me in the right direction. any help greatly appreciated. Thanks George