"Jetel" was the unofficial trade mark of J. Thibouville-Lamy & Co., of 10 Charterhouse Street, London, E.C., a firm which was established in Paris in 1790. They were still a leading musical instrument maker out of the same address in 1915.
They were large manufacturers of every type of brass and wood instrument ' who advertised their extensive "steam factories at Grenelle, La Couture and Mirecourt."
A bottom end brand made for them by Matthew was "Down South" a design based on early 5 string instruments with a paddle head and only 10 tension hooks
also see Jetel