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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.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.I don't mind you using these for your own personal research, but if you want to use them elsewhere such as on an internet forum, a web site, or in a publication, please read my copyright notice first and include attribution.If you have any questions or comments, please don't hesitate to contact me via my Contact me page.

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.

The really definitive "fingerprint" of a movement is the keyless work, which is why materials parts suppliers such as Bestfit and Schwartchild often show only the components of the keyless work in their movement identifications.

However, to see the keyless work requires the dial to be removed, which may not be possible, and many older movements are not documented in these references.

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.

Compare the bridge shapes shown in Jobin for the Eterna movements and those seen on Stauffer branded Eterna movements.

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