Thank you Argo for your willingness to help. I believe I will write to V-C and see what I can find out, and yes, a translation of the catalog description would be most helpful. Do you think T3 could possibly be the S/N? I don't know how many of these they built but it couldn't have been too many.T3 is the only mark that is on all three components of this gun. Assembly no. possibly? Regards,Sandlapper