Do takedown levers/locking bolts have any distinguishing characteristics that indicate what model or era of luger they belong to, or differentiate them from others?
I know commercial DWMs have numbers on the bottom, and Erfurts have the erfurt mark. What about military DWM bolts? Are they different in shape or appearance? Do serial numbers have different orientations? I see some with numbers centered, while others have the numbers left or right of the center.
I have seen a couple with no numbers and the seller said it was a field replacement.
I know side plates are different (from the study here), but are the takedown levers also different?