The lists looks good except nonicks' A409518 should be at the top of the list with Sandycounty's A401182 second. So far no Single Rings with out signatures have shown up with serial numbers between the Signature Single Rings serial numbers. If this trend continues we might someday have an idea of how many of the Signature Single Rings were made.
I corrected the list in the places that I could (in thread postings and in the wiki). They should reflect correct numbers now and have nonicks above Sandcounty's. I sure hope I hear back from Robert Waits soon!