PAT 24 May " is stamped where the setting lever screw would be. However, it has no exceptional features; e. The shape of the plates and bridges is very distinctive. I thought at first glance that it was the same as Fontainemelon 6 but closer examination showed that the top plates were quite different from that movement, and the keyless work is different too. Electa Catalogue Confirmation that these are indeed Electa movements was provided to me by David R. US Pat 24 May , no setting lever screw. Thanks to Marc for providing the photo. When the pin set is released the return spring pushes the yoke and the sliding pinion back into the winding position. Click image to enlarge Fontainemelon movement 4. The entry shows that this calibre was size 13''' 13 ligne, about Click image to enlarge Early Omega Keyless Work. Longines were countering this by making watches of a quality that anyone would be proud to show off to their friends. If you have a movement like this, don't just look at the centre bridge because A.
The visible mechanism at the top is the keyless work that allows the watch to be wound and set by the crown. Mystery Movement 1 Click image to enlarge Click image to enlarge This movement has me baffled. Electa Catalogue Confirmation that these are indeed Electa movements was provided to me by David R. Granges , who also made watches under the brands Grana and Certina. I first identified the movement pictured as an IWC calibre 64 by comparing the shapes of the plates and bridges with diagrams in IWC " Fournitures" catalogues, and the IWC museum have since confirmed that it is a genuine IWC calibre 64 movement listed in their records. The style of damascening on the movements pictured here, individual straight or wavy lines rather than overall decoration of the plates with a repeated pattern, was principally used by American manufacturers, and in America is called damaskeened or damaskeening. All these features, cut bimetallic temperature compensation balance with gold timing screws, gilded plates, blued screws, full jewelling and an overall high level of finish, show that Longines was making watches intended for the top end of the British market. The number 5 is my number, not the Fontainemelon calibre number which I have not yet discovered and which, given the early date of this movement, may never be discovered. The entry also shows that the same basic movement was made in two layouts, calibres reference and In addition to the absence of a maker's name, the plates are gilded and the screws blued to a purplish colour favoured by Longines. If negative set keyless work is present in one of these movements, the setting lever screw, which normally releases the stem, is not present and the legend "U. Electa Negative Set When a negative set mechanism is present a setting lever screw, which normally releases the stem, is not fitted, as you can see in the picture to the left. Setting of the keyless work into winding or hand setting position is achieved by moving the crown and case stem in the familiar way, the case stem being held in either the winding or hand setting position by a detent in the pendant. Click image to enlarge Thanks to Marc for the picture The movement shown here is a customised version of the Eterna calibre movement with none standard bridge shapes. I have also seen this movement with the brand "Stayte" on the distinctive central finger as shown in the picture below. I couldn't find anything like this in the Bestfit and Swartchild books, but the keyless work is so unusual with the intermediate wheel is attached to yoke that I managed to find a post Watchmaker Forum which shows a repair to a watch clearly marked Omega which has the same keyless work. Click image to enlarge This is another movement by Fabrique d'Horlogerie de Fontainemelon , identified by the William Tell mark of an arrow through an apple on the bottom plate under the barrel bridge. The shape of the cover plate work that holds the yoke and return spring in place is very distinctive. Click image to enlarge Fontainemelon movement 6. I also have an indirect centre seconds version of this movement, with the seconds hand driven off the arbor of the third wheel by multiplier gearing. The movements shown in the photograph and the picture from Jobin are both savonnette layout, suitable for wristwatches with small seconds at 6 o'clock. This is a very "English" layout and I am sure that this calibre was created for the British market. They have a straight line Swiss lever escapement, a cut bimetallic temperature compensation balance with gold timing screws, and a blued carbon steel balance spring with a Breguet overcoil. The keyless work cover plate is the characteristic shape that identifies all these similar movements by Fontainemelon. It was done either by hand or machine, and in the highest grade of America watches was much more elaborate than the simple version seen here.
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