Thanks, Pete. That's a wealth of information. I wasn't aware of the John Manton connection.

The letter about Joe Manton's books being sent to India on his death was apparently written to Teasedale-Buckell and is reproduced in the Manton chapter of "Experts on Guns and Shooting". It runs " We regret we have no likeness of the late Joseph Manton, nor of his nephew, Mr. Frederick Manton, who was sent by his uncle to start the firm in Calcutta". Funny that the letter gives Frederick as the son of John, not Joseph (or was there a third brother?). Confusing family, these Mantons.

I'd also question the date of the founding of the company in 1828. The lawsuit (http://www.indiankanoon.org/doc/1252857/) states the date of foundation as 1825; although it is human to err, a company's lawyer could hardly be expected to go wrong in this, no?