Contact Browning.
browning hi power or replica of browning hi power (not sure)
fabrique nationale of belguim was the first producer of the browning hi-power.
Your browning hi-power was made by F N in belguim for browning in 1968.
The RN in the middle of your serial number indicates that your Browning Hi-power was made in the year 1997.The Browning Hi-power is produced by FN in belguim.
A Browning Hi Power
I am aware of only one chambering in the Browning hi-power,that is 9mm parabellum.
With the serial number that you provided,your Browning Hi-power was produced in the year 1968.
Could it be that your browning hi-power is marked 70C19171? If it is then it was made in 1970.
Need a detailed description of the overall condition of your Browning Hi-power to give you a correct answer to your question.
The 76C prefix dates your browning 9mm hi-power to 1976.
I can say that your Browning Hi-power was made after 1977.Browning can give you the exact date at there customer service Dept.