diamondback pricing

I have been collecting Colt snake guns for the past couple of years. I started with a 1981 blue 6" Python which I still have and then I got bit by the bug. One Python turned into another turned into an Anaconda turned into a Cobra and turned into a Diamondback. Then..... turned into SS, Blue...

I have an opportunity to aquire a 1978 (the owner volunteered this) blued 6" DB for about $950 here in California. I noted it had rubber grips and a blue two latch plastic box that looks like it was made for it. From the photos I've seen the finish looks good and the owner said he was the second...

If this is a often repeated question I apologize but from the first few pages of search results within the forum it seemed like most of the Diamondback .22's that were getting pricing were either slightly used or 4" barrels. My father just came across a .22 diamondback that he had purchased...