That's quite surprising, by the late 1890's and throught to to the 1910's many manufacturres in the UK sold them with their cameras (mainly between lens type) and people with older cameras used the version that fitted the front of the lens. Essentially there's just a slight difference in the casing. They were still being made up until about 1960.
Perken, Son & Rayment, and
also Lizars use the shutters themselves as an intregal part of the front standards on some cameras. Maybe by the time Burke & james became the sole US agents demand had declined due to the introduction of shutters like the Compound and not much later the Compur, and of course in the US you had the early Bausch and Lonmb shutters.
Ian
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