F.P Geerinckx of Paris is the retailer - it was made in Saint Etienne.
Here are the proof marks:
-- Chambers marked in CM (6.5)...i.e. built after 1889 but before mid 1912; See this line:
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=484326-- It is proofed for PT so after 1900 but before 1912;
-- It's Berthon Freres so after late 1910. That pretty well nails the date of manufacture down between 1911-1912.
1). Martin-Gerest was a famous gun maker in Saint Etienne from the 1860’s to 1900 when he retired. He was highly regarded in the city and among other things he edited the French gun magazine “Bulletin Mensuelle de L’Armurerie Francaise”. Here is an article in the British press on his retirement:
2). his firm was bought by the Berthon brothers in 1900, who had worked for him. They then made guns under the name of Gerest-Berthon. Here is a sample of a bill of sale/label from Gerest Berthon. You’ll see various medals won by the firm at industrial expositions which were very popular from from the Crystal Palace exposition in London in 1851 right up to the World’s fair in New York, etc. in the 1960’s. The Grans Prix and gold medal for Paris 1900 was actually won by M. Gerest before he retired.
3). The Berthon brothers took out several patents in the 1900-1922 period. In 1922 they sold out to Laspoussas, which became Laspoussas, Driol & Cie in 1923. Here is a sample of a testament for a worker who worked for them from March 1938 to October 1938, dated 21 October 1938. You’ll note in the lower left corner “fabricants concessionaires du Didier Fusil avec Canon Plume Eureka"
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