Saxon 's date matches the data I have but I think it may be in error. 1917 was well into WWI and I do not think the production of .25 caliber pocket models were a priority during late war production. I in fact believe production of the .25 caliber model may of even stopped at some point during the war. The table both Saxon and I are using is an estimation of annual production so it is not exact. I feel more comfortable saying sometime between 1915 and 1917. The table shows 11,000 in 1915, 7000 in 1916, 5000 in 1917, 5000 in 1918, 9000 in 1919 and 10,000 in 1920. So with the numbers rounded to the nearest 1000 production slowed considerably between 1915 and 1918. The demand and production of the .32 caliber was 2-8x more and the C-96 would of been ramped up as well and I am not even including rifle and machinegun production.
Regards,