Ahhhhh - that thing... They are about but are not common even over here. I've seen only a handful of them in my time, and I've seen (and owned) a lot of rare stuff.
One thing about them, the foresight post was/is fragile, and came in one height which dictated the use of the PH5C style of rear sight that had the adjustable vernier to zero the rear sight rather than adjusting the height of the foresight post.
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