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Europe: United Kingdom
Lens 1: 25 mm x 36 mm; Lens 2: 43 mm x 59 mm; Lens 3: 37 mm x 43 mm
Set of three experimental pieces foreshadowing the Sutcliffe visible, solid, downcurve bi-focal lens. Glass. 1: crescent-shaped, blue-tinted portion. 2: clear glass portion with jagged edges and inset round aperture. 3: blackened glass portion with round aperture.