Hi Doug, Although I'm getting into this a bit late, perhaps I can add a little information on the movement itself. Positional adjustments are attained by careful poising ensuring even weight distribution of the balance-hairspring system as well as careful control of the shape and polish on the balance pivots. Should be no surprise that the graph shows the first Caliber 311 Style Numbers started in 1935 and they ended in 1937. For years in which no watches could be identified, we relied on watch crystal catalogs. Hess and James Dowling, in their book The Best of Time: Rolex Wristwatches, An Unauthorized History, clam that the name was just made up.
If you're buying or selling a car, it's not enough just to know that it's an old Ford. The only way to know which decade applies to the watch at hand is by careful study of available resources, including vintage advertisements and actual watches. For openers, your watch, lacking a number of important features required for railroad time service, is not a. This is by far the easiest way for a watch repairer to verify that he worked on the watch. In the Style Caliber Table, calibers 421 and 426 are shown to the right of Style 725. Be careful though, that curiosity found in some Gruen collectors turn collectors into obsessed researchers. Jewel-count is only one indication of quality, but there are many others.
A small number of Swiss companies have archives and can tell you a lot about a watch. For some watches, particularly Swiss or European watches, it is much harder to determine the age of the watch because there are no serial numbers. In the eighteenth and early nineteenth centuries there may have been a few individual American watchmakers who worked in this way, but very few of their watches survive. Stamped or Neatly Engraved Numbers Numbers stamped or neatly engraved into a watch case or on a movement are most often the manufacturer's serial numbers, but in some cases they are references to a patent or registered design which can tell us something about the watch. Top right: 1880s Columbus 18-size.
There is nothing written on the ratchet. Initially, Dietrich and Fred designed the watch movements in America and manufactured them in Germany. Is the ticking of the watch clean and crisp, with a faint metallic ring more like a ting-ting-ting than a tick-tock-tick or does it sound rough, like something is loose or dragging? Both of these techniques, using Wadsworth case serial numbers and movement serial numbers, pinpoint a watch to its specific date of manufacture, but are also approximations. American companies continued to make only pocket watches, while Gruen made both wrist and pocket watches. Many towns in the Jura mountains were almost entirely dedicated to the production of watch parts and the assembly of these into finished watches.
That particular watch is stamped with 422-002, or 002-422 The Style Caliber Table proved to be a distraction while we were doing our research because there is such a wealth of data that can be mined from it. This is probably the most common question watch collectors have. In general, for all time periods, it is important to understand that Bulova watches never provide an obvious date of manufacture anywhere on the watch. Dial were made by specialist dial makers, hands by hand makers, cases by case maker, and so on, preserving the division of specialisation in these areas that allowed the Swiss to overcome the challenge from America. By studying literally thousands of Gruen watches, and developing techniques for dating and identifying model names and recording every detail about each watch we believe we have reached a significant breakthrough that will help Gruen wristwatch collectors more definitively pinpoint the age of a given specimen. These watches are difficult, if not impossible, to identify.
Gruen was one of the first companies to design movements specifically for wristwatches; it made rectangular movements for rectangular watches, while most competitors still used small, round movements. Write this number down and compare it to the charts on this website. Inside that shield logo you should find a letter U with a letter T coming up out of the U, which indicates that it came from the Unitas factory, which made a variety of movements but was particularly known for their pocket watch movements. An earlier Gruen publication claims that Dietrich offered 1. The number imprinted in the back of the case wouldn't be a serial number would it? In the 1940s, solid gold models appear to have a stronger date correlation. Often watches were sent out with the barrel bar blank so that a retailer could have his, or his customer's, name engraved on it. Since your serial number falls between those two numbers, you know that your watch was made in 1.
This meant that even those Swiss manufacturers who did wish to put their name onto the watches they made were prevented from doing so on watches that were for export to Britain and her colonies; which before the Great War were a large and important market. When mass media and advertising came along it became worthwhile to advertise and build up a brand name in the public's minds. Vintage watches are a unique and relatively complex mechanical antique that can span a range of several hundred years of production, with millions of watches produced and thousands of variations. The movement finish of a watch traditionally refers to its appearance: color, metal or decoration. Therefore I think it is from the 1920's.
System developed and agreed-upon by American watch manufacturers to determine the diameter of a watch movement. If Railroad watch standards changed in the late '30's to have 19+ jewels, does 17 jewels predate the movement to before the late 30's? The company was reorganized in 1. You usually have to take the back off the watch case to see the movement serial number which may appear anywhere on the watch movement. Be sure to use the serial number on the movement of the watch itself. Rolex is by far the single largest luxury watch brand, producing about 2. There are good records for most of the American factories' production data and you can find out when a watch was made from its manufacturer and serial number. In addition to learning about individual watches, the Style Numbers can teach us a lot about Gruen's use of movements in watches.