SN dates to 1966.
Your browning hi-power was made by browning in 1967.
You must call Browning.
Your browning high power was produced in 1980.
1993
Browning High Power
Browning's web site has a sn search function.
Proofhouse.com has Browning sn info.
Your browning high power was made during the years 1945-1954 in which browning and FN of belguim did not keep track of the production figures of the high power.The records began with serial number 72251 which was in 1955.
The 2 letters PY found in the serial number sequence indicate that your Browning High Power was made in the year 1982.
100-700 usd
1976
I purchased it in 1965 but have no idea when it was made