| 
					Colt 1908 Vest Pocket .25 ACP magazines have 
					6 
					viewing holes | 
				
					| Type | Top | Finish | Base | Year (approx.) | 
				
					| I | Rounded | full blue | unmarked pinned base | 1908-1912 sn 1 forward
 | 
				
					| II | Rounded | two-tone | unmarked pinned base | 1912-1915 sn 105000 forward
 | 
				
					| III | Rounded | two-tone | marked pinned base | 1915-1920 sn 121000 forward
 | 
				
					| IV | Rounded | two-tone | marked crimped base | 1920-1922 sn 230000 forward
 | 
				
					| V | Straight (Top made straight to function with the magazine 
					safety disconnector)
 | two-tone | marked crimped base | 1922-1939 sn 306000 forward
 | 
				
					| VI | Straight | full blue | marked crimped base | 1939 to end sn 407000 to 409XXX,
 1946 - 1948
 sn 420001 to end of post-war production at 420705
 | 
				
					| By rounded and straight top, when viewing 
					the side profile of the magazine, these shapes are apparent. 
					The straight top with notch was used to better engage the 
					magazine safety disconnector (Tansley Device) that was 
					introduced at approx. sn 141000. |