Hi Steve,
I own said gun and and took said picture. Please PM me with your email and I will happily correspond with you and provide pictures of the Pieper barrels and entire gun.
I did post some limited pictures several years ago but thought I deleted all public copies; not that I have a particular issue with them being used but was being contacted unsolicited.
As mentioned, the gun was bought by me for a meager sum with the plans that I might restore it myself and with no idea about the barrels (actually bought through an online auction). It was clear that gun had some nice engraving and some beautiful wood under years and years of abuse and I thought it could be a fun project.
I would not say that the barrels had been blued so much as "browned" from years of rust and cleaning, rust, cleaning, etc. I owned the gun for about 1 year before I even realized the significance of the barrel.
I happened to be in Buck Hamlin's shop when we realized the damascus was patterned with wording and thus I decided to leave it with him for restoration which he did complete for me. The gun in totality was a beautiful as I expected.
My detailed research has only ever found one other Pieper with similar damascus and that was written up in the DGJ. That is not to say there is not others, I've just never found any proof of others.
Again, I'm happy to provide pictures and allowance for you to use in a book, please just contact me via PM and we will work out the details.
Cheers
Andrew