Pinnacle watch dating
Most older watches, including most Wittnauer watches, are snap back cases.
Fabrique Horlogerie Fontainemelon (FHF) was a large manufacturer of Swiss ébauches who did this a lot.
There’s a twist though: after you match, you only have 24 hours to start the conversation, otherwise he’ll disappear forever.
It’s only available on i OS so far, but is coming to Android soon.
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 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.
The movements are definitively identified as Eterna by their keyless work, but their top plates are different from those shown in Jobin.