SKB, That wasn't done by a cyanide bath, that is the work of the oxy-acetlene torch. Interesting rifle, I would like to see it in the flesh, however. With Uncle Dan, anything is possible. if you notice that the engraving on the rib continues onto the sight base. If an aftermarket rebarrel, it is a good one. Serial numbers look right too. I'd like to see if there is a line where rifle barrels were inserted into a "monoblock".

All the best, Mal