Old bread plate or empty late nineteenth pocket. Sterling silver, mercury second punch as (former export punch French works). Master goldsmith Emile Puiforcat (ep office penknife).
Marking j widmer is a Swiss jeweler who sold it. 17,2cm diameter, weight 150g.
In good condition, to report scratches. And two 5mm marks the center (last photo). The item \The seller is \This article can be shipped worldwide.