A shotgun designed to shoo trap with.
Please add the serial, but it is likely a single barrel trap gun such as the BT99
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.
The browning superposed lightning trap shotgun will command a nice price.If your shotgun is between 60%-90% in its original finish and a good set of bores,you can get between 700-1,000 dollars.
You will need to call Browning,s customer service dept for the exact year of production.The model bt99 trap shotguns were originally made from 1968-1994 by Miroku of Japan.The current models were made from 2001-to present.
The prefix of 4M to your serial number indicates that you have a Browning standard weight model auto-5 shotgun,which was made in the year 1964.If it was a trap model,it would be so marked.
While you do not state weather your Browning superposed lightning is a 12 gauge,or 20 gauge.I am going to assume that it is a 12 gauge.The serial number indicates that your shotgun was made in the year 1959.If your 12 gauge Browning shotgun has between 60%-90% of it,s original finish remaining and a good set of bores it will bring between 750-1,050 dollars.The same value applies if this shotgun is a trap model also.
100-800 usd
$1100-1400
You will have to call Browning since you don't mention the serial number.
500 USD
Pretty certain you mean a Citori. If that is what you are looking at, it is a over/under trap gun.