![]() ![]() The swing-ring case was advertised as the most dust-proof and moisture-proof case of its time. The case body and back are made as one piece, so there is no separation between the case back and the case body. That's because the watch movement is mounted in a ring which is hinged to the inside of the case body. More people damage their watches trying to open swing-ring cases than any other case style. Weekly and Horological Review, March 13, 1901. I've never seen a case that wasn't a standard right-hand thread, so righty-tighy lefty-loosey applies.Ĭrescent Watch Case Company ad for Swinging If it's a screw-off back there should be no sign of a hinge attaching the back to the body. For a screw-off back, you should be able to see a seam-line that separates the back from the body of the case. Let's look at each of these in more detail: Screw-off Pocketwatch Case BackĪs the name suggests, the backs of these sorts of pocket watch cases simply unscrew. ![]() It's probably one of four most common types: a screw-off back, a snap-off back, a hinged back, or a swing-out case. If we want to open the watch case so that we can see the movement (the working parts) of the watch, then we've got to figure out what kind of case it is. This simple habit will save you from a costly case or crystal repair down the road. So to close the cover on a hunter-case watch: first depress the latch button, then close the cover with your fingers on the edge of the cover, then release the latch button. ![]() Sometimes the clearance between the case lid and the crystal is VERY small, and we've seen many a broken crystal from someone closing their hunter case with a big ol' thumb pushing down right in the middle of the case-lid. The case closure is closing tight and safely and no lid is over-stretched or has dents.It's also important that you don't press the cover down into the crystal of the watch. Overall, the watch is in very good and - given the age - fantastic condition. The movement is in excellent clean and unscratched condition and is running fantastic after our service. The back shows and engraving (AMG? AMC?). The hand-cut applied Breguet Numerals are as beautiful and high class, as is the highly jeweled (17 rubies) premium Agassiz movement. It is thus around 100 years old now, and it shows some minor signs of aging and oxidation - nothing problematic and very authentic. The dial is obviously in its original condition and not refurbished. SA - the company that formed Wittnauer watches and another subsidiary of Longines at that time. The case is hallmarked 18KWG and AW for the case maker Albert Wittnauer & Cie. The white gold alloy was invented in 1912 in Germany and thus it is one of the first examples of a white gold pocket watch - historical. This was for sure the pinnacle of Longines pocket watches at that time and it makes it a very rare watch, as yellow gold or silver was usual but solid white gold was a very rare exception back then, almost 100 years ago. This open face Art Deco Agassiz (Longines) pocket watch, dated 1922 or 1923 according to the Agassiz movement serial number, made of solid 18K white gold - even the dust cover is white gold and not base metal. ![]()
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