Value: Beretta O/U 28 ga

What would be a realistic value for a 28 guage Beretta? It's marked "S686 Special" Condition is 99% . It appears to be about 10 years old with a silver, lightly engraved receiver . The frame is a true 28, rather than 20. It's choked IC/ M, not a choke tube provision. It's fired, but has only a light impression around the firing pins. I prefer built in chokes on a small guage like this, so the lack of tubes is not a problem, although I know most people are gah-gah over them. I think this model was discontinued in 95, but I'm not a Beretta expert, and the Blue Book entry for the 686 has me confused. thanks for any help!