What is the value of a 1971 browning 12 gauge Diana grade superposed lightning shotgun 2 barrel set in a sx case?

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.