There were several different Browning models used as DU guns. Auto-5, A500, B-80, etc... Need to know exactly which model, and whether the supporting Ducks Unlimited paperwork is still with the gun, and so forth.
Semiautomatic shotgun
50-500 usd
100-300 USD
A Browning Ducks Unlimited 12G in perfect condition is worth $1100-1400 That's what the last six got sold for. It's a truly beautiful shotgun. The rusty ones at pawn shops sell for $500+.
50-500 usd
500 USD
Browning.com has a sn fucntion under customer service.
The value between $500.00 and $850.00
Please include a serial number along with a model number to get the answer you are looking for.
There were many models of shotguns being made in 1970. Please be more specific
In your question, you answer your question.
It's only worth what a buyer is prepared to pay !!