The stamp on the upper (left) barrel is
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-- "Depose" - "Registered trademark"
-- "Acier Comprime" - "Compressed Steel" - identical to Whitworth's name for his steel in England patent ran from 1865-1879 - maybe a couple of years added.
That stamp is identical to this one:
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It was often used by Saint Etienne barrel maker Ronchard Cizeron. It may have been used by others in the late 19th - 1st 30 years of the 20th century as well since it appears quite often.
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Argo44,
Thank you for the information, and very fine images.
