I was trying to find when my XP was manufactured. I found the information shown below, but not sure if there are any additional dates available.
My first four numbers are 7510. The only information I've been able to find so far is the Remington XP-100 were made between 1963 to 1998.

Year - # made - Serial number at the end of the year.
1962 - 13 - 1013
1963 - 5564 - 7300
1964 - 960 - 8400
1965 - 651 - 9100
1966 - 678 - 9300
1967 - 706 - 10000
1968 - 894 - 11000
1969 - 921 - 7501000
1970 - 967 - 7501967
1971 - 870 - 7502837
1972 - 1042 - 7503879
1973 - 981 - 7504860
1974 - 1245 - 7506105
1975 - 1041 - 7507146

Edited: So after doing some more research, Wikipedia has a writeup on the Remington XP-100. If you scroll down to the Caliber Production By Year, it has a listing when each caliber XP was manufactured.

It looks like mine was made 1993-1994.

Wikipedia Link

This message has been edited. Last edited by: K9TXS,