Let me throw some grease on the fire and say that the suffix code (E4100, E4600, E8300, N3500) does not necessarily imply a physical difference in the material part. The E8300 could well mean a second run, or manufacture batch, of the earlier part design. I agree that in the vast majority of cases there IS a physical difference, however it just may be nothing more than casting codes. There are also numerous discrepancies between the US part catalogs and the Japanese. I'm finding many cases where the E4100 refers to the S30-S and PS30 indicating the "root" model types with E4101 or E4600 (for example) used for various market destinations. In many cases there is no apparent difference in the part. Safety glass would be used for mirrors in this time period. I agree. Great mirror, Alan. Put that one on my "must have" list!