Merci Fab. For the Murphey Darne....
-- Chambers are marked in cm. i.e: It was made between 1889 and summer 1912.
-- It is proofed for PT so it was made after 1900.
-- The SN 14696 indicates it were made 1903-4?
(I once had estimated the yearly output of Darne from 1 to 50,000 in 1910 but can't find it):
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=484199&page=10Ted has warned of inconsistencies in Geoffroy Gournet's serial number and date list for Darne guns:
On the above line, there are two Darnes pictured with SN's that may be very close to what the chart claims:
-- Per dated Didier-Drevet barrels the changeover from cm to mm occurred in summer 1912;
-- The two "C" series Darne numbers below - one with cm, one with mm - were probably made around 1912 if Darne made 2,600 guns from 1910 to 1912.
-- C692, a 12 gauge with a chamber stamp "6.5".
-- C643, a 20 gauge with a chamber stamp "70".
C692
C643