[Ron Wood]

Gene,
The serial number of your Luger is 6841d, the lower case letter on the frame is part of the serial number. As G. van Vlimmeren noted, the stock lug on your Luger has been ground down and is indeed the consequence of a misinterpretation of the restriction on adding a shoulder stock to a handgun. It is still a neat gun and I am glad you can keep it in the family. Storing the gun in a foam lined case will not hurt your Luger as long as the foam is not damp and the gun has been well oiled. I kept my Lugers in foam lined cases for years when I was moving about and none of them were adversely affected.