I have seen these rifles in person, and all is not what it seems. The William Lamb Patchbox rilfe is not signed. The advertising would lead you to believe it is signed by him. William was just one of 87 gunsmiths who worked in the Guilford County - Jamestown Longrifle School. I have seen two other rifles signed by him that generally look like this, (combination of Full-stock, Patchbox, and back-action lock), but I have also seen and owned rifles signed by other Jamestown gunsmiths with this same set up.
Those of you that own John Bivin's Book, the "Longrifles of North Carolina" should turn to pages 96 & 97 and look at Gun number 18. This is all that is original to the gun listed as a Ribelin. This rifle is also not signed anywhere. The other known Ribelin rifles are signed I.R. or J.R. on the Patchbox lid. Signed Rifles by George Eagle and John Eagle are also found. I have one of them that is signed G. Eagle on the Christmas Patchbox lid. Before you invest too much money in this rifle, remember that the entire fore-stock, the lock, triggers, trigger guard, side plate and the barrel are all new to the rifle. The restoration is well done.
Here is a couple of photos of two of my favorite guns, both described above.
This first rilfe is signed by Robert H. Polk. He worked in Southern Guilford County in the 1820's and 1830's. His gunshop was located on Pole Cat Creek. He later moved in Indiana.
You will note that the Patchbox is identical to the one of the unsigned Longrifle at the auction that is advertised as a William Lamb.
Here are photos of my George Eagle.
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This is the only Rowan Longrifle that I have seen that features an Eagle Sitting on top of the Christmas Tree.
I will also include a photo of a Christmas Tree Patchbox signed by Isaac Ribelin.
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I hope this information helps.
Michael Briggs