Tracy

I have a pair for a Luger also. I traded for them at a local Gun Shop where they were on a mixed S/N "X" marked pistol. I was finally given the same info that Orv gave you. I am not sure that they are Aluminum but a form of Pot Metal because of weight. However, they are Aluminum in color, checkering is sort of flattened out and not sharp. Back has some milling done on them to fit frame which they do very well and very shiny where milling has been done. They make an interesting converstion piece which not many people (except those who have exposure too lots of guns) have seen. I have hauled them around to several NAPCA conventions and found only a very few people who have ever seen them.