Can you post up a few photos? Also, we need a serial number to date the horn to give an accurate price range. Value will depend on several factors including age of the instrument, original lacquer or relacquer, wear to the finish, damages or past damage repairs, and pad condition. Looking forward to seeing more information.
The biggest issues with Selmer bari saxes from this era are twofold; 1. They typically don't tune well at all and 2. The key mechanisms are antiquated. It probably has more collector's value than actual player's value. The problem you're going to find is that most average collectors are looking for altos and tenors not baris. My guess is that you could find someone to pay in the $2000 price range for a Selmer Super bari in decent condition. Best of LucK!!