Saxonia Calculator

Jul 27, 2025

Saxonia Calculator, c. 1905 Starting bid: € 1.200 | Estimate: € 2.500 – 3.500 Rare German stepped-drum calculating machine by Rechenmaschinen-Fabrik Saxonia, Glashütte i.S., with 6 input sliders, 7-digit revolution counter and 12-digit results mechanism in oak...

Thomas’ Arithmomètre

Jul 27, 2025

Thomas’ Arithmomètre, c. 1870 Starting bid: € 1.800 | Estimate: € 3.000 – 5.000 No. 1345, small model of Thomas de Colmar’s calculator of 1820, marked: “Thomas de Colmar, à Paris, Inventeur”, with 6 input sliders, 7-digit revolution...

Bonatz “Berolina” Spiegel-Reflex-Camera

Jul 27, 2025

Bonatz “Berolina” Spiegel-Reflex-Camera, 1901 Starting bid: € 800 | Estimate: € 1.200 – 2.000 Paul Bonatz, Photographische Manufaktur, Invaliden-Str. 108, Berlin N. SLR camera for landscape format 9 x 12 cm, compact, lightweight, yet sturdy...

Busch Double Speed Petzval-Type Portrait Lens

Jul 27, 2025

Busch Double Speed Petzval-Type Portrait Lens, after 1872 Starting bid: € 1.200 | Estimate: € 1.600 – 2.200 Rath. Opt. Ind. Anst. formerly Emil Busch, Rathenow, Prussia. Engraved on the side “Portr. 48 4.” (indicates the lens diameter in Parisian...

2-Day English Marine Chronometer

Jul 27, 2025

2-Day English Marine Chronometer, c. 1925 Starting bid: € 1.200 | Estimate: € 1.500 – 2.000 No. 5602. With fusee movement, 4 1/3-inch silvered Roman dial marked “H. Hughes & Son, Ltd., 59 Fenchurch St., London”, subsidiary ½ seconds and 56-hour...