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I will need a serial number to your auto-5 shotgun to get you the correct answer to your question.
how much is a steven's 12ga model 770 shotgun made by savage arms corp worth?
Impossible to answer without a detalied description of all markings and features.
No such model made.
100-1000 USD or more depending on specifics.
About 100.00
Browning did not make an Invector model. That is the type choke system of the shotgun.
I would need to know the Browning model to be of any help to you.
Your gun is a Standard Weight model made in 1961. The suggested retail price when new was $134.50 with a plain barrel - $154.50 with a vented rib barrel.
I would need to know what model of Browning shotgun you are asking about in order to answer your question.
50-100
Excellent Condition $130-150 Good $110-130 Fair $80-$110