One item I have never been able to track down is a photo of the waterfall badge on Rick Wagoner's UV #50.
It supposedly says Happy 50th Birthday, with the signatures of his three sons. There really is a fine line on this one between being a regular production truck and being a Signature Series.
It was assigned serial #000050 (not 100050) in recognition of his 50th birthday, but being a UV when 03 officially did not have any UVs except the Signatures, and having (supposedly) a one-off waterfall badge, it is easiest classified with an asterisk as Serial #50 with specs matching the Signature trucks.
Oddly, GM's official Production History does not show the 27 UVs (25 Signatures, plus #26 and #50) under US totals, only in the Total Production column.
I have also never seen a under-hood photo of Wagoner's UV - I wonder if having it triggered as a Signature Series to get it UV paint also got it the painted intake cover with the billet strips.
Damn - I really miss Sig 12.