100-1000 USD depending on condtion and EXACT configuration, papers, box, accessories.
BT99
Browning doesnt show the BT99 as a 299 model code. They list the BT99 as a model 149. Below is the link to the Browning codes.
Please add the serial, but it is likely a single barrel trap gun such as the BT99
100-1000 usd
If you go to browning,s home page there is a way to age your shotgun there.
100-1000 USD
50-650 usd
Japan
The value of a Browning BT-99 shotgun typically ranges from $800 to $1,500, depending on factors such as its condition, age, and any modifications or included accessories. Collectible or rare models may command higher prices. It's advisable to check current listings and sales to get a more accurate estimate based on the specific model and market demand.
A shotgun designed to shoo trap with.
Value depends on the features of the gun, and the condition. Please see the link and look up your trap gun for a general idea of value.
You have not provided the entire sn. Call Browning for help