I'll buy as many as you've got for $450...
Not many made, and not many come up for sale. Recent prices I have seen without box or papers run $666 (non original grips) to $800. Typically in the $675 or so range based on Gunbroker transactions.
As I recall one came up for sale on this forum a few months back and sat around a few days but sold in the $650 range or there a bouts.
Some of the gun price books say put a premium on the .357s due to "collector" value, but I don't see it based on sale prices.
I have one with box and papers and I value it in the $675 range, but it's not for sale...