Your question spans 100 years, and thousands of different guns. Good questions get good answers. We need info to get you info.
50-5000 usd
Maybe 70 USD
It is not possible to value a weapon with just the serial number.
50-500 depending on specifics
50-100 USD
$400-$500 in excellent condition.
100-500 or so
made in 1976
50-600 usd
10-800 usd
100-500 USD
value of belgium browning 25 auto baby blued with walnut grips