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So, take a stroll down memory lane to remember all of our past Word of the Year selections.
These are smaller, simpler, and less easy to identify with certainty.The setting lever spring was an evolution of the earlier simple cover plate that simply kept all of the parts of the keyless work in place.Stem set keyless work needs a detent to hold the crown in the winding or setting position.Fabrique Horlogerie Fontainemelon (FHF) was a large manufacturer of Swiss ébauches who did this a lot.To see a clear example of this look at the section below about Eterna movements customised for Stauffer & Co.Manufacturers altered the appearance of their movements by changing the top plates, but the basic layout remained much the same.
Note that the setting lever screw is an exception to the rule about screw placement, it can be in different places in stem set and pin set varieties of the same movement, or absent altogether if the keyless work is negative set.
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.
Although some movements such as the IWC calibre 64 leap out to the experienced eye, other are less easy because of similarities between the products of different manufactures, and manufacturers altering bridge shapes for different customers.
In fact, the apparently huge variety of Swiss watches is explained by this phenomenon: once the basic layout in a round movement of the barrel, train wheels, escapement and balance was arrived at, there was little scope, let alone need, to change it.
The keyless work under the dial that handles stem winding and setting is often said to be the "fingerprint" of a movement.