That looks like a very nice bike and in quite good condition from what I can see. Threaded adjusters in the dropouts indicate a quality frame. The over BB cable guide is interesting for that period. Do you know the tubing?
As for value I can only guess, maybe $150/200? Would this Bella bike be sought after in the US or have a particular following? We in the U.K. are not familiar with the brand. Maybe
@Gravity Aided can add something more having knowledge of the US market.