Back to the original images posted by Bro. Day. Our friend sent me high resolution pics of the 1879 B and I now believe the barrels are also Toncin and not laminated steel. AND I found another gun owned by the same fella, a D Lifter, which might have the same pattern.
Please see
http://www.picturetrail.com/sfx/album/view/23997270
It would be fascinating to know how/why these high grade barrels appeared on late 1870s C&B Lifters. Were they left over from the D.B. Wesson supply? Did Wesson's barrel guy go over to Meriden and make some Laminated steel and Twist barrels in-house in that same time frame??
See
http://docs.google.com/Doc?id=dfg2hmx7_1742r4n6vcz