»Petzval-Type Lens by
C. W. Häring«, c. 1862
C. W. Häring, Braunschweig. No. 279,
height: 7 ⁴/5 in., Ø 4 ¹/3 in.
Estimate: € 500/800
US$ 650/1.050
Reserve: € 260/US$ 350

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