Hi AB,
As I remember there IS a serial number on the back side of the cone. Right now they are in my Valencias (846B). I don't remember the numbers though. I was just curious because there was no letter after the 416 8 stamped in the rear of the driver. They are from 1975 so I presume they are pretty early in the 416 series. I'm kind of new at this. I'm learning every day. I love this forum. It has brought me back to a place I have missed for many years. Most of the time the discussions are WAY over my head, but as I said I'm learning.

As I said earlier, my Val's are completely original. I was thinking of upgrading the 806 drivers to 902's. Also changing the XO's. Any suggestions on the XO's?
Thanks...