Impossible to answer without the serial number.
Your browning hi-power was made by browning in 1967.
1976
Could it be that your browning hi-power is marked 70C19171? If it is then it was made in 1970.
You will have to call Browning with the serial number to find out.
You will have to call Browning. Your sn does not appear in any reference I have.
1980
Made in 1981.
The 2 letters PY found in the serial number sequence indicate that your Browning High Power was made in the year 1982.
The serial number should indicate the year of manufacture for your Browning Hi-power.Please include it in your question to get a correct answer.
Browning.com has sn data under customer service
Browning.com has sn data under customer service.