Look at the serial number right above the year 1963. Here's a link of colt. All serial numbers should be verified from the manufacturer prior to any purchase or assembly.
Left side of the receiver is marked with the rampant. Enter the serial number, without spaces or dashes, to search the database. It shows sp 360200 and below = preban.
Any particular colt model you're interested in, standard government profile barrel rifles, hbar rifles, lightweight carbines, m4 carbines, or hbar carbines? Left side of the receiver is marked with. If multiple models appear for your serial number simply match the date with the appropriate model, as certain. Match223 and shadowblade, i would guess your rifles were made after the.
Manufactured in 1964, the second year of sp1 rifle production at colt, with an approximate serial number range of sp00101 to sp02501. With that being said there wasn't anything in the serial number that designated if it was a.