$500-$1400.
Not a valid Browning serial number.
A Browning over and under is worth about $1,000-1,500 on it own and the fact that it's a Belgium made Browing increases the price significanly. I would say somewhere in the range of $500 to $750 more. The belgium made Browning is the most collectible and popular.
50-600 usd
Requires professional evaluation.
50-1000 usd
No way to value with just the gauge and serial number. Could be 100-100000 USD
50-500 uSD
50-600 usd
70-700 usd
Based on description 100-500
A few hundred to a few thousand.