I have seen a shop in Schwabing, on
Leopold Strasse, between
Muenchner Freiheit UBahn Stop and Clement Strasse, on the side of the street opposite
Karstadt that handles old and rare books and does binding. Kind of inconspicuous, a sign on the corner of the building, think it is one of those places where you go down the driveway and around to the back. If you walk that side of the street you should be able to find it. If I see it in the next couple of days I will put in more detail (address and name maybe even!), but no guarantees. Know it is there, though.
Tinap