Patt.20  (1915 - 1925)
Strand

15/20A Perch Arc, 6 x 8-in. piano convex lens, including rear operated "Diamond" shutter, slide focus. Lined teak housing.
Introduced c1915 replaced c1925 by Patt.23 early version

Documents

1925 Strand Catalogue - Perch Arc (1925)
From Strand Archive

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