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Mystery brass lens: Extra Rapid Aplanat F:7 No. 3

Lenses & Lens Accessories - www.largeformatphotography.info
I recently got this lens from an Ebay seller in Ireland for $99. It has no manufacturer engraving of any kind. I measured the focal length at approx. 8 inches/200mm, 15 aperture blades, and max/min f-number of f/7-f/44.

It also covers my 4x5 without vignetting. I did research beforehand (antiquecameras.net & Google), but found nothing. Does anyone have an idea of the manufacturer, production date, intended purpose, etc?


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