There is no such thing as an ugly Luger
..it's strange that Betty is without her proof marks on the right side of the receiver. So I quess they have been ground off by the previous owner. Same with the barrel.. I think there should be more than just the one mark. Does the upper part have more blueing than the frame? ..any serial number on the left side of the reciever?
I think the grips might be right. The number on the inside of the sideplate is a production code, nothing on the other side?
As to the mag, you are right about it having a Simson part proof.