RETRO BLACK RIFLE - .223 Cal / 5.56mm SP1 SERIAL NUMBER RANGES
setstats
Year     Serial Number Range
1963         SP00001-SP00023
1964         SP00101
1965         SP02501
1966         SP05600
1967         SP08250
1968         SP10750
1969         SP14000-SP14653
1970         SP15001-SP15473
1971         SP16001
1972         SP19401
1973         SP24201
1974         SP32601
1975         SP43801
1976         SP55301
1977         SP67651
1978         SP83400
1979         SP96401
1980         SP112801
1981         SP134601
1982         SP158201
.223 Cal / 5.56mm
CIVILIAN RIFLE &
CARBINE
GUIDE
SP1 Serial Number
Ranges
Colt R6000 / SP1
Colt R6001 / SP1
Carbine
Colt R6002 / SP1
Colt R6003 / SP1
Carbine
Colt R6004 / SP1
Colt R6007 / SP1
Colt R6010 / SP1
Note: All SP1 serial numbers start with SP, not SP1.
If you see a 1 there, it
does belong to the serial number.
Early SP1s were marked "Colt's Patent Firearms"
Later SP1s were marked "Colt's Firearms Division"

Below are examples of early and late SP1 serial numbers and
roll marks:
Early
Late