Unless the person that owns it reads this question, your chances of finding out are almost none.
Exactly how is the pistol marked? 9mm browning serial number 72C44338
1971
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
Browning's customer service can assist you.
You must call Browning.
1990.
1989
1971
your browning hi-power was made in 1974.
The serial number.
1986
1961