It is possible to make an 18K gold frame with lugs which will hold this coin watch while being worn as a wrist watch. Make sure to press on the bezel part of the case and NOT on the crystal!! Keep the coin top closed at all times except when checking time, winding or setting. When done, press the crown back in and press the small watch case back into place. Now you will be able to turn the crown and hands to desired position. If you need to set time- slide the tip of your fingernail under the crown where it protrudes from the case and pull gently out, less then 1 mm. The watch comes on the original Corum leather strap and corum gold plaque buckle. Wind gently until you feel resistance of the main spring being fully wound. The watch is made out of a 20 American gold coin with the date of 1891. Lift just enough to be able to wind the watch with the small crown located at 1 o’clock. ![]() Do it while holding the coin with the forefinger and thumb at 12 and 6 o’clock of one hand, while lifting the small case with a tip of the forefinger of the other. To wind the watch lift the inner small case up by the tab at 12 o’clock. Once the cover is open, you are able to see the time. DO NOT force it to open more as you will damage the top cover. Press it while holding the coin firmly on both sides and the top flips open. On the 3 o’clock side of the case there is a small rectangular button. The rest of the inner parts are 18K gold. The parts taken from the $20 gold piece are 22K gold. The difference was that in some of them the movement gained another jewel and was chronometer grade with more decoration and finish on the plates. Again, this same movement was used by most of the other Swiss watch companies mentioned above. ![]() It is a very thin mechanical movement with 17 jewels. The movement in this watch on the other hand, Kocher & Cie made majority of the gold coin watch cases used by Corum, Ebel, Eska, Gubelin, Rolex, Vacheron Constantin, Piaget, Audemars Piguet and others. This company was founded in Grenchen in 1918 and then the company moved to Selzach in 1922. The case which was made by utilizing a real American $20 Gold coin was most likely made by Sylvan Kocher & Cie. Although the dial and the movement are signed Mathey Tissot we need to go a bit deeper. Offered here quite an unusual solid gold pocket watch.
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