This is one of those older 18 size Elgins, a Mat Laflin grade 55, where the movement is held in the case by just one case screw. In the opposite edge of the movement, from the screw, is a pin that sticks into a hole in the inside edge of the case.
For whatever reason, these pins are frequently missing and I end up making one. Sometimes, the watch has been rigged to stay put without the pin, as this one has.
A small bit of copper has been set under one of the barrel bridge screws as a makeshift case washer.
Copper is a surprising material to find any place near vintage watches. It is a very soft and highly reactive metal, without much use in old horology.
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