hello lancaster,

if I do the math ...

sn 26190 =year 1934
sn 17862 = ?
sn 11542 = year 1909

that's 25 years between year 1934 and year 1909 ...
and 14,648 guns between year 1934 and year 1909 = 585 guns per year
so 10 years production would be 5,850 guns .... sn 11542 plus 5,850 = sn 17392 = year 1919
so ..... my gun sn 17862 would be year 1919 to year 1920 ....
and, if production became more efficient over the 10 years ... my gun could be even earlier .....