Basically impossible to value with no other information.
The 76C prefix dates your browning 9mm hi-power to 1976.
600 USD, no more
500 USD
Value of a Browning Hi Power in caliber 9mm Luger (9mm parabellum) will vary, depending on EXACT model (thee were several) markings, and condition. It may be as low as $300, or over a $1000 for the scarce specimens.
Yes, It is the same as the 9mm Hi Power Manual.
1968
Belgium
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.
your browning hi-power was made in 1974.
100-1000 USD or more depending on specifics