Sir Howard Grubb's sight has its design origins in the Voigtlander "Kontur" camera viewfinder, although I am unsure which came first. My money would probably be on the Voigtlander given their research into optics goes as far back as 1756 when the company was first founded.
I also see a parallel here both politically and technically with the Singlepoint sight, whose use and private purchase was banned during the 1970's by Britishtroops serving in Northern Ireland.
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