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Fabrique Horlogerie Fontainemelon (FHF) was a large manufacturer of Swiss ébauches who did this a lot.
Movements from the 1920s or earlier, with cover plates that don't have integrated detent springs, don't generally appear in the Bestfit or similar books and are therefore harder to identify. The first step in identifying a movement is to determine its size in lignes.
Once this system had been introduced it was quickly taken up by other manufacturers.
By the time the Bestfit and other similar movement identification books were introduced, which seems to have begun in the 1940s, most of the watches current at that time had cover plates with integral detent springs.
In early stem wound and set watches the usual Swiss "positive" set keyless work (in contrast to American or negative set) incorporates this detent as part of the mechanism, usually a notch on the yoke, whereas in later watches it is integrated into the cover plate as in this watch.
The long thin arm acts as a spring, the two notches at the end serve as detents that hold the setting lever in either its usual winding position or in the hand setting position when the crown and stem are pulled out.
The keyless work under the dial that handles stem winding and setting is often said to be the "fingerprint" of a movement.
For example, The Bestfit Book includes the diagram shown here of the parts of the keyless work of ETA calibre 715 and Eterna 710.220 It is a small selection of often unidentified old movements that I have been able to positively identify.I don't intend to show movements with their makers names on them, because they are already identified.So, take a stroll down memory lane to remember all of our past Word of the Year selections.Contents Measuring Movements Photographing Movements BTCo: Beguelin, Damas Longines 13.34 Longines 12.92 Gallet Electa wrist Gallet Electa pocket IWC calibres 63 and 64 Stauffer Eterna Tavannes cal 330 - 333 Tavannes cal 370 - 371 Fontainemelon 1 Fontainemelon 2 Fontainemelon 3 Fontainemelon 4 Fontainemelon 5 Fontainemelon 6 A. Schild calibre 168 Early Omega Wristwatch General Watch, Helvetia Marvin series 362 Dimier Brothers Mystery movement 1 Mystery movement 2 Manzoni Arogno A Michel Cal.The shape of the cocks and bridges is more of an aesthetic consideration; so long as all the pivot holes and screw holes are in the same places, then bridges of very different shapes can be freely interchanged.