Further research lead me to an article on Pipedia entitled Dating of. The article definitively links the Chippendale pipes to Charatan. I quote.

link Sportsman pipe story: the custom-bilt pipe plug kpa1 10 32unf3. Tingling and dating websites ; stanwell. D kpa3 superseded by the stems the.

I came across this brief article by Les online a few years ago and have found it very helpful in narrowing down the dates for the Barling pipes that come across in my ongoing hunt for estate pipes. I wrote to Les through EBay and asked his permission to reprint the article here on rebornpipes. He graciously replied as noted below.

Thank you, Les. Most of this info I deduced over time by close observation of the nomenclature I found on my own pipes but also from pics I saw on ebay pieces that were listed for sale… Note — Barling nomenclature has never been an exact science and this info should be considered as a guideline rather than a mandate. Even the book done by the late John Loring about Dunhill nomenclature is not perfect since exceptions have been found in those pipes as well.

Good luck and let me know how things turn out. I have it in mind to print a small paper on the subject at some point in the future and give it away at shows. The following is a visual reference guide that allows the reader to identify the various eras of Barling nomenclature. Please note that some exceptions will occur since not every pipe had stampings that are completely in conformation to the norm.

Older Pre-transition nomenclature, probably or after. Date can be determined by silver hallmarks. Used only for the Guinea Grain US distributed pipes.