Through a series of mergers and acquisitions, the Hamilton Watch Company eventually became integrated into the Swatch Group, the world's largest watch manufacturing and … This watch is powered by an automatic Caliber 225M movement. This Tri-Compax has a very clean original silver linen dial with outer blue tachymetre scale. This watch is a calculator chronograph with precision slide-rule and is powered by a caliber 12, 17 jewel automatic movement. The all original black dial with is in excellent condition with no visible flaws. This Angelus "Répétition" 5-Minute-Repeater has the ETA 2801 movement by Dubois Dépraz in Vallée de Joux. The original silver textured dial with applied slash marker has a subsidiary seconds register at 6 oclock. The case of this piece is also very strong. 14 Kt Yellow Gold Pulsar P3 ... We believe the case of this watch to be unpolished. This is a lovely and rare Jumbo Cartier Tank from the 1980's. Circa 1955, Movado SS Tempomatic Sport circa 1950's This watch is just a slightly different version of the Datora. The bi-directional black bezel has 60 minute markings. The design of the case in pink gold and the exceptional dial make this Movado a great addition to any vintage watch collection. This elegant watch is powered by an automatic movement which just makes this piece all the more special. The condition of the case is very very strong. We believe it to be unpolished. The date is written on the dial in an Art Deco style in blue. The watch is in excellent condition with an original dial and a lightly polished case. 1,539 Likes, 8 Comments - MIT Science (@mitscience) on Instagram: “A “sensational” map of the brain A team of researchers from Massachusetts Institute of…” This great vintage automatic Omega comes in its original Omega Automatic box. The 1765 is a rare model and does not appear for sale very often. Its over-sized steel case has a double hinged case back, white enamel chapter ring with Arabic numerals, an inner dial, a caliber 18.69N manual wind movement and a large winding crown. The Pulsar P3 was the first LED watch with a date function. This ultra thin watch is only 5.5mm thick, yet houses an automatic movement. This is a beautiful example of the Breitling Premier ref 788 anti-magnetic chronograph with a black dial, Arabic numerals, three subsidiary registers, a screw down case. This great looking watch comes on a blue strap with an 18k white gold Cartier deployment clasp. The watch is powered with an automatic ETA movement. The Buren (now Hamilton/Buren) Micro-rotor was the first patented automatic wristwatch movement to eliminate the sizable external oscillating weight inherent to most automatic winding watches. During the expansion of the railroads in the U.S., Hamilton maintained over 56% of the market. This is a wonderful 1970's IWC Edison Electronic Reference 3402 wristwatch. Circa 1961, Patek Philippe Calatrava Ref 570J This is an extremely rare 37mm Audemars Royal Oak from the late 1970s. This amazing work of art is powered by a super thin manual wind movement. Circa 1955, Universal Genève Polerouter Date This is a wonderful and iconic watch and come with an Archive from Patek Philippe. Cristóbal Vila ’s short video, “Nature by Numbers” For help and extra practice with the concepts in this chapter: Khan Academy has a good explanation of how to use the Sieve of Eratosthenes to find prime numbers Explanations and examples for the order of operations Rational and irrational numbers This pristine watch comes with its original green Jaeger LeCoultre box and Guarantee papers. The official title of "first Micro-rotor movement" is still in dispute among some horology aficionados, even though Buren patented their design in 1954,[12] and Universal Geneve applied for their patent in May 1955.[13].

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