You indeed have found a treasure, common to find the early Erfurt's without a holdopen but not the DWM's, the serial numbers on the magazines should have large numbers and run from top to bottom on the wood bases opposed to side to side in small numbers.
Good that the luger has not been reblued nor touched up, check inside the holster for an ink stamping on back of flap. The holster may or may not have the same unit stamp as the pistol.
A few words of advice in case you do not already know is to avoid dressing up your holster with creams/ oils and so on as this will breakdown the leather over time, also take care not to stretch the holster flap to far back looking for stamping as this effects the stiching and causes it to break.
Looking forward to your photo's.