The rework term is something I am usually a bit leery of using - although true, it sounds like a gun was torn down and refinished
As said above, an army luger made in 1914 by the royal arsenal Erfurt. At some point it was transferred to police and received a sear and mag safety in the early 1930's. Without any unit markings, you can only guess where it has been.
See the FAQ in the new collectors area for pictures of sear and mag safeties.
Ed