For those who do not have a copy of Compliments of Col. Ruger by John C. Dougan, I will share some info found in these pages about the Jerred Single Six engraving project.
Jerred engraved the 1st Single Six for Ruger in August of 1954. I took nearly 2 years to work out the pattern details and price. Pages 119-121 have a letter from WBR dated 2/16/1956 requesting Jerred not to engrave Single Sixes in the pattern worked out with Ruger as "outside " work.
On pages 187-189 is the letter dated 5/19/1958 ending the RSSE program and advising Jerred he is freed from this agreement and the Factory will forward inquires to him.
This gives rise to the opportunity of locating 2 distinctly different Non-Factory Jerred engraved Single Sixes; those he might have done before February of 1956 and those he did after May of 1958.
Someone more experienced with Jerred engraved Single Sixes than I ought to start cataloging these. I suspect they are really quite rare. I have only ever had 2 of these Factory RSSE's; they are in better hands now!
Oh, and on the Dougan book, I have a few, New, for $35 mailed by Media Mail.