I am the purchaser of the above mentioned 624 6.5". Final price was $650 shipped. The gun was perfect NIB still with the inspectors sticker on bottom of buttstock. However no paperwork was included, that was known up front, I had an extra set of papers for it already.
To me $700 for a NIB, with all paperwork is reasonable, I would certainly buy another one for that, as was previously said, they will not make anymore and the prices will only go up.
Compare these fine old firearms with what is being offered now and there is no need to think about it further. Of course the old ones don't come with a free hole in them.
RD