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Colt Model 1903 Pocket Hammerless .32 ACP & Model 1908 Pocket Hammerless .380 ACP - Factory Magazine Variations

Colt 1903 .32 ACP magazines have 7 viewing holes
Type Top Finish Base Year (approx.)
I Rounded full blue pinned, unmarked 1903-1913
II Rounded full blue pinned, unmarked (some with indent in follower) ca. 1904
III Rounded two-tone pinned, unmarked 1913-1914
IV Rounded two-tone pinned, marked "CALIBRE .32" in a straight line 1914-1915
V Rounded two tone pinned, marked "CAL. .32" over "COLT" 1915-1920
VI Rounded two tone crimped, marked "CAL. .32" over "COLT" 1920-
mid-1920s
VII Straight
(Top made straight to function with the Type IV magazine safety disconnector)
two tone crimped, marked "CAL. .32" over "COLT" 1926 -  early- 1940s
VIII Straight full blue crimped, marked "CAL. .32" over "COLT" 1938 -  mid- 1940s
Colt 1908 .380 ACP magazines have 6 viewing holes.
I Rounded full blue pinned, unmarked From 1908 (beginning of production, first year only)
II Rounded blue pinned, marked ".380" in a straight line hand stamped on the toe 1908-1909
III Rounded blue
to
two-tone
pinned, marked "CALIBRE .380" in a straight line 1909 - 1915
IV Rounded two tone pinned, marked "CAL. .380" over "COLT" 1915 -  1920
V Rounded two tone crimped, marked "CAL. .380" over "COLT" 1920 -  early-1920s
VI Rounded two tone crimped, marked "CAL. .380" over "COLT" (Large letters) 1920 - mid-1920s
VII Straight top two tone crimped, marked "CAL. .380" over "COLT" (top made straight to function with the Type IV magazine safety disconnector 1926 - early- 1940s
VIII
 
Straight top full blue crimped, marked "CAL. .380" over "COLT" 1938 -  mid-940s

Colt Model M .32 and .380 single line magazine variations.  This variation followed the unmarked base plate variation for both calibers.

Colt Model M Magazine Profiles - .32 caliber magazine has seven viewing holes in the side and .380 caliber magazine has six viewing holes.

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