This silver-plate tea strainer by l'Orfèverie d'Ercuis fits into the spout of a teapot so when the tea is poured, the loose leaves in the pot are strained. The same pattern on a different style strainer is shown in an Ercuis 1911 catalog so I'm dating this conservatively as being from that time period although it could be older. The centaur maker's mark with O E (Orfèferie Ercuis) is shown in the last photo.
From https://www.silvercollection.it/continentalsilverplateefg.html: Founded in 1867 by Adrien Céleste Pillon (Ercuis is the name of a little village of the Oise). After his bankruptcy (1870) the venture was revived by George Maës, glass cutter in Clichy. The company turns to arts of the table; coffee and tea sets silver plated metal or, silver cutlery massive. He opens stores in Paris, in province and abroad. The mark "Ercuis" and its punch "the Centaur" are universally known. The factory is still active in present days.
Dimensions: 2 ¼" across strainer basket, from one edge to the other.
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