Sold2023Elgin Model 600 Marine ChronometerElgin Model 600 Marine Chronometercirca 1943mahogany double-box case, 48 hour time-only marine fusee movement with detent escapement, signed on the dial and movement, numbered "N103" for theSee Sold Price
Sold2022Hamilton Watch Co. Model 21 Marine ChronometerHamilton Watch Co. Model 21 Marine Chronometercirca 194130-hour 14-jewel chronometer movement with free sprung balance and detent escapement, held in a gimbaled brass ring and inside a double-boxed caSee Sold Price
Sold2023Hamilton Watch Co. Model 21 Marine ChronometerHamilton Watch Co. Model 21 Marine Chronometercirca 194130-hour 14-jewel chronometer movement with free sprung balance and detent escapement, held in a gimbaled brass ring and inside a double-boxed caSee Sold Price
Sold2023A Hamilton model 21 marine chronometer with boxesHamilton Watch Co., Lancaster, Penn., a model 21 marine chronometer with boxes, 14 jewel, key wind and set fusee movement with straight line damascened nickel plates, spring detent escapement, large mSee Sold Price
Sold2023Hamilton Watch Co. Model 21 Marine ChronometerHamilton Watch Co. Model 21 Marine Chronometercirca 196530-hour 14-jewel chronometer movement with free sprung balance and detent escapement held in a gimbaled brass ring and inside a mahogany case, sSee Sold Price
Sold2022Collection of Physical Demonstration Models and Technical DevicesCollection of Physical Demonstration Models and Technical Devices 1) Carbon arc lamp, demonstration model by John Browning, London, original lacquered brass, 2 graphite electrodes, one height-adjustabSee Sold Price
Sold20234 Spoked-Wheel Calculating Machines and a Demonstration Model4 Spoked-Wheel Calculating Machines and a Demonstration Model 1) Rema I, 1914 onwards, Braunschweiger Rechen­maschinenfabrik Rema GmbH, serial no. 4340, with 9, 8 and 13 digits, with wood base anSee Sold Price
Sold2017Tesla Coil Demonstration Model, c. 1915Tesla Coil Demonstration Model, c. 1915 With label: "Elektro Vulkan, Kromeriz", circular wood base, inner coil on porcelain isolator, outer coil on 3 glass columns, height 15 ¾ in., Ø 10 1/5 in.,See Sold Price
Sold2018Bell Telephone Demonstration Model, c. 1900Bell Telephone Demonstration Model, c. 1900 Manufacturer: E. Leybold's Nachfolger, Coeln-Rhein. Open-works telephone model for demonstrating the mechanism, on mahogany base, very good original conditSee Sold Price
Sold2015Electrophysical Demonstration Model, c. 1890Electrophysical Demonstration Model, c. 1890 France, marked "HRFA", mahogany, thick-walled glass container (fixed to the base), 6 electric connections, 2 coils, 2 electrodes inside of the glass, one sSee Sold Price
Sold2022Demonstration Model of the Single-Cylinder Steam Engine "Lady Margaret"Demonstration Model of the Single-Cylinder Steam Engine "Lady Margaret" Hand-cranked museum model, polished steel, brass and cast metal, mahogany-lagged cylinder Ø 3 1/5 in., crosshead guide in lSee Sold Price
Sold2023Demonstration Model of an Early Electric Motor, 1890Demonstration Model of an Early Electric Motor, 1890 To demonstrate the windings of an armature, on turned wood base, height 15 in. Demonstrationsmodell eines frühen Elektromotors, 1890 Zur DarstSee Sold Price
Sold2015Zoetrope (Demonstration Model)Zoetrope (Demonstration Model) Home-built large demonstration zoetrope, wooden base, drum Ø 11 ¾ in., crank drive, with 5 strips. Zoetrope (Demonstrations-Modell) Großes Demonstrations-Zoetrope ausSee Sold Price
Sold20236 Typewriters Keyboard Demonstration Models6 Typewriters Keyboard Demonstration Models 1) Torpedo, wall-mounted model, with indication of the angle degree in 4 steps. - 2) 3 x Adler, table models, with key, lever and platen, 2 different modelsSee Sold Price
Sold2019Demonstration Model 4-Stroke EngineCountertop teaching tool. Works all the way. Made by Hohm. Measures 15" tall.See Sold Price
Sold20174 Demonstration Model Electric Motors, c. 19104 Demonstration Model Electric Motors, c. 1910 Various models and constructions, height up to 7 in., untested. 4 Demonstrationsmodelle Elektromotoren, um 1910 Unterschiedliche Bauformen und KonstruSee Sold Price
Sold2016English Telegraph Demonstration Model, 1902English Telegraph Demonstration Model, 1902 Dated 1902; consisting of key, relay and sounder; on mahogany stained base, size 13 x 7 in. An excellent exhibition item. Englisches Telegraphen-DemonstratiSee Sold Price
Sold20236 Typewriter Keyboard Demonstration Models6 Typewriter Keyboard Demonstration Models Official factory models. 1) Mercedes, table model, with key and lever. - 2) Erika, Seidel & Naumann, table model, with key and lever. - 3) Triumph, table modSee Sold Price
Sold2019A Painted Metal Piston Generator Demonstration ModelA Painted Metal Piston Generator Demonstration Model Second Half 20th Century Property from a Midwest CollectorSee Sold Price
Sold2022Demonstration Model of an Early Carbon Grain Microphone, c. 1900Demonstration Model of an Early Carbon Grain Microphone, c. 1900 With series resistor and switch, wood base stamped with no. 188937. Demonstrationsmodell eines frühen Kohle-körnermikrophons,See Sold Price
Sold20183 American Steam-Engine Demonstration Models, c. 19103 American Steam-Engine Demonstration Models, c. 1910 1) Cast-iron model of a railroad locomotive engine, reversible, with Stephenson steering, hand-cranked, width 18 ¼ in. - 2) Steam motor, casSee Sold Price
Sold20234 Typewriter Keyboard Demonstration Models4 Typewriter Keyboard Demonstration Models 1) Torpedo 6, table model, type-lever mechanism, with four angle indicators, back with description, official factory model. - 2) Wall model "Wagenaufzug" toSee Sold Price
Sold20235 Typewriter Demonstration Models5 Typewriter Demonstration Models 1) Olympia, electric, partial cutaway model, with motor, carriage and parts of the mechanism. - 2) Adler, working model with 5 keys, tabulator and keys for the carriaSee Sold Price
Sold2018Demonstration Model AEG Hand Drill, c. 1950Demonstration Model AEG Hand Drill, c. 1950 Model UHB10, transparent plastic body, bakelite, in oak case, pressure switch on the front (defective), 23 3/5 x 13 ¾ in. Demonstrationsmodell AEG-HaSee Sold Price
Jun 26Azca AuctionsA UNISEX OMEGA STAINLESS STEEL AUTOMATIC WRISTWATCH. CONSTELLATION CHRONOMETER.£550
Jun 30APR57 GalleryTag Heuer Chronometer Sport Model SS Automatic Men's Wrist Watch - $8K APR w/COA$1,600
4 days LeftBidhausRolex Submariner (No Date) 124060-0001 - Submariner Oystersteel New Model 2020 Automatic$10(1 bid)
5 days LeftDawsons AuctioneersAn Omega Constellation Chronometer Bi-metal Watch. Model: 1431 - 1980140 Case Material: Steel -£280
Jun 30APR57 GalleryTag Heuer Chronometer Original Sport Model Men's SS Wrist Watch - $7K APR w/ COA$1,375