Here's my track on the 64 snubbie:

Smith & Wesson 64 2 in Barrel. Revolver in .38 Spl. Blue Book of Gun Values (36th Edition) indicates between $275 in 95% condition and $515 in 100% condition for this gun. I have 39 recorded prices for this model gun from $300 to $824 over a period of 7 Yrs 5 Mos ending August 31, 2016. The average price as of that date was $463. No refurbs, no refinishes, regular sights. All represented as 95% or better. No distinction for engineering revision, if any, no special editions, no distinctions for box, papers, tools. Current or last MSRP is $689.

The last 10 prices I have for this model since 10/4/2013 range from $384 to $824 averaging $542

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Bob