Impossible to answer without a DETAILED description of ALL markings, type of action, barrel length, etc..
1971
1971
It was made in 1971
The 71V prefix to the serial number indicates that you have a browning auto-5 magnum shotgun that was made by FN in belguim for browning in 1971.
12 gauge BSS were first made in 1971 and 20 gauge in 1972.
100-400 USD
1971
The value of a 1971 Browning 12 gauge Diana Grade Superposed Lightning shotgun with a two-barrel set in a case can vary significantly based on its condition, documentation, and market demand. Typically, such a shotgun can range from $3,000 to $7,000 or more. Factors like original finish, the presence of accessories, and provenance can further influence its worth. It's advisable to consult a firearms appraiser or a trusted auction house for a more accurate valuation.
10-1000 USD depending on specifics
Your serial number indicates that your Browning light weight auto-5 shotgun was made in the year 1971.
A browning auto-5 shotgun made in belguim in 1971 should bring between 350-550 dollars depending on condition for a standard,or magnum version shotgun.If you have a sweet-sixteen model these can bring between 575-1,100 dollars or more depending on type of barrel with the shotgun and overall condition.
BSS was made from 1971-1987