The long barrelled -3's are not as hot a seller as say the 4" or even the 6" guns.
I passed on one nearly identical to yours recently. The seller was asking $750. I countered at $450. He came to $650 and held there. I was prepared to pay $500 but no more.
In your photograph it would appear as though there is some freckling in the nickle on the barrel. If that is so, it hurts your gun quite alot.
Drew