Mercedes/Gauss Calculator

Jul 27, 2025

Mercedes/Gauss Calculator, 1907 onwards Starting bid: € 7.500 | Estimate: € 12.000 – 15.000 Low serial no. 1610, Mercedes-Bureau-Maschinen Ges. mbH, Berlin, S.W. 68, German patent 194527 from 23 March 1905, stepped-disc calculating machine for all four basic...

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...