BRAND/JENAMA: VINTAGE NEW OLD STOCK AVIA VALJOUX 7730 CHRONOGRAPH MEN'S WRISTWATCH
CIRCA/TAHUN: 1960's
MODEL: MILITARY CHRONOGRAPH
CRYSTAL/CERMIN: VERY CLEAN ACRYLIC
MOVEMENT/ENJIN: SWISS 17 JEWELS VALJOUX 7730 MANUAL WINDING CHRONOGRAPH MOVEMENT
HANDS/JARUM: LUMINOUS GOLD TONE/ LUMINASI KEEMASAN
MARKERS/TANDA WAKTU: BLACK 500 METER TACHYMETER & 60 SECONDS AND STICK HOUR MARKERS/ARABIC LUMINASI DGN TANDA 60 SAAT HITAM
CASING : GOLD PLATED TOP & STAINLESS STEEL BACK/ SADUR EMAS & KELULI MEASUREMENT/UKURAN: 41mm DIAMETER AND 42mm LUG TO LUG
DITANDA/ENGARVED BACK CASING: AVIA WATCH CO
CROWN: GP/ SADUR EMAS
STRAP/TALI: NEW GENUINE BLACK LEATHER/ TALI KULIT HITAM BARU
SIZE STRAP/SAIZ TALI: 8.5"
DISCONTINUED MODEL... VERY VERY RARE AND VERY HARD TO FIND!
EXCELLENT CONDITION AND KEEPING TIME
SANGAT SEMPURNA DAN TEPAT MASA
BRIEF HISTORY OF VALJOUX CHRONOGRAPH MOVEMENT
Originally farmers, the locals turned to doing craft on the kitchen table during the freezing winters when they couldn't do much else, and thus a long line of watchmakers was born.
In 1844 an inhabitant of the Joux Valley named Adolphe Nicole, applied for the patent of a heart-shaped cam design, which enabled the building of the first useful watch with a chronograph in 1862.
Valjoux was founded in "Valley de Joux" in the mid-to-late part of the 19th century. Valjoux originally made timers (stopwatches) and chronograph movements.
In 1890 or so, they invented the column wheel which revolutionized the chronograph movements. Virtually every chronograph movement made since then used a column wheel untill the late 40's or so when Landeron invented the cam/lever shuttle as a cheaper alternative.
A majority of chronograph movements today use a cam/lever switch. Throughout the 20th century, manufacturers like: Valjoux, Lemania, Landeron & Venus made the vast majority of all chrono movements.
When the watch business collapsed in the latter half of the 20th century, Venus failed and Valjoux bought them over, thereby Valjoux attained the rights to the new cam/lever and switch of Cal 188 that Venus had made. This was rebranded as Val 7730 and sold for a year or two until the Valjoux redesign of this movement was made - the 7733.
Valjoux's modification of the caliber results in the more cost effective manufacture of the movement and the design set offs the series creation of 7734, 7735, 7736, 7737, 775x and 776x calibers. These basic cam designs are still used today which features the familiar start, stop and reset action now seen in all mechanical chronographs and stopwatches.
Over the years, chronograph manufacturers had improve on their own designs and the designs of other manufacturers.
In 1939 Landeron came out with the pioneering calibers 47 and 48. Valjoux produced the 13 ligne ratchet wheel caliber from 1946, and also made 175,000 copies of the 1948 Venus 188 cal. up to 1973.
The Valjoux 7730 (14 ligne, 6mm high) was produced until 1967. However, the much more successful were the 7733 (with 30 minute or 45 minute sub dials), the 7734 (with date), and the 7736 (with 12-hour sub dial) made between 1969 and 1978.
Almost 2 million of these movements left the factory, destined to tick away merrily in watches made by such names as Hamilton, Helbros, Le Jour, Memosail, Wittenaur, and Breitling.
Note the use of wire springs at various places around the movement. Some enthusiasts regard this as a weakness in the design, as they can go out of adjustment.
Still, the ubiquitous 7750 movement (an automatic-winding descendant of the 7733) uses the same springs but nevertheless has a well-earned reputation for ruggedness and reliability
No comments:
Post a Comment