I just bought (1 month ago) a blued LNIB 6" 19-4 for $595. For where I live, I thought was a decent deal. The gun really is LNIB, not fired since factory; nice find...
The gun came from a dealer that bought an estate collection from a guy that collected a bunch of J and K frames. He bought them back in the day, and just put them into his vault, they were all LNIB 'unfired,' it was a very nice collection...
So, I think the one you are looking at is probably a fair price. Of course, tough to say without seeing the condition, and barrel length.