The serial number.
browning used the last two digits of the year before the serial number on the 9mm from 1970 until 1976 so your 9mm was made in 1973
You must call Browning.
With what you have provided, only that it is a 9mm
1971
1971
Made in 1969.
1989
Serial number and or proof marks
1961
1969. The first 2 numbers are the year, C indicates Hi-Power, the 2575 was the serial number sequence made that far that year. For more info, http://www.browning.com/customerservice/dategun/detail.asp?id=35
1986