Looking at my own link http://www.music.ed.ac.uk/euchmi/ujt/ujt2929.html I saw to my surprise that this remarkable instrument was not only made in my home town of Huddersfield but was played for 20 years in Almondbury church where I was a choir boy. I don't think the dates overlapped though. Serpent 1840 to 1860, me about 1960.

Mitch