British "Polish sights"
I think the question about GB "Polish sights" has found an answer thanks to Wojciech (Woj) Mazur in Poland.
The sights were made by SA Polskie Zaklady Optyczno (PZO) , Warszaw, and seems to be an improved early Zeiss type.
Here it is (photo from Woj):
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Foxhole sends
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