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Model 1903/08 Hammerless Instruction Sheet PDF (1.3MB)
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Colt Model M 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 two-tone pinned, unmarked 1913-1914
III Rounded two-tone pinned, marked "CALIBRE .32" in a straight line 1914-1915
IV Rounded two tone pinned, marked "CAL. .32" over "COLT" 1915- 1920
V Rounded two tone crimped, marked "CAL. .32" over "COLT" 1920 - early- 1920s
  Rounded two tone crimped, marked "CAL. .32" over "COLT" 1920 - mid-1920s
VI Straight
(Top made straight to function with the Type IV magazine safety disconnector)		 two tone crimped, marked "CAL. .32" over "COLT" 1926 -  early- 1940s
VII 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 two-tone pinned, marked "CALIBRE .380" in a straight line 1908 - 1915
III Rounded two tone pinned, marked "CAL. .380" over "COLT" 1915 -  1920
IV Rounded two tone crimped, marked "CAL. .380" over "COLT" 1920 -  early-1920s
V Rounded two tone crimped, marked "CAL. .380" over "COLT" (Large letters) 1920 - mid-1920s
VI 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
VII
 		 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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