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AR15.COM
7/28/2012 4:12:39 PM EDT
I have a 6" royal blue marked E98xxx, which would indicate it was made in 1975, but right below the serial it is stamped with a P. Was curious to know if there was any significance to that and thought someone here might know.
7/28/2012 7:06:20 PM EDT
[#1]
The P should be the firing proof mark.
 
7/29/2012 12:01:13 PM EDT
[#2]
Actually the "P" is a normal Colt inspectors stamp.  These are stamped below the serial number and may be any letter.

The Colt proof mark is a tiny "VP" in a triangle stamped on the left front side of the trigger guard area.  That's the Colt "Verified Proof" stamp.
There's another inspectors stamp on the left rear trigger guard.