The Model “M” Pocket Hammerless are classified as Types I through IV. As with so many other models, there is plenty of confusion and debate over serial number/dates of variations, but here’s what I’ve compiled over the years:
There was no M1908 .380 Type I; all of the Type I were M1903 .32 pistols.
The Type I had a 4" barrel with a bushing.
M1903 .32: 1903--1907?/08?
SN 1 to 72,000
The Type II had a shortened 3.75" barrel, still with a bushing.
M1903 .32: 1907?/08?--1910
SN 72,001 to 100,458?/105,000?/105,050?
M1908 .380: 1908?/09?--1910
SN 1 to 5,291?/6,250?/6,251?
The Type III had a bushing-less 3.75” barrel with an integral muzzle lug.
M1903 .32: 1910--1926?/27?
SN 100,459?/105,001?/105,051? to 468,000?/468,096?
M1908 .380: 1910--1926?/27?
SN 5,292?/6,251?/6,252? to 92,893?/93,000?
The Type IV is a Type III with the addition of a magazine safety.
M1903 .32: 1926?/27?--1945
SN 468,001?/468,097? to 562,000?/572,215?
M1908 .380: 1926?/27?--1945
SN 92,894?/93,001?¬ó136,000?/138,009?/~150,000?
As far as the stocks, best call GPC and ask someone to eyeball the stocks as you read off the points of identification, if you want to sure.
Steve