Value is between $200 and $300 based on what I paid for mine and what I normally see them go for. I have tried on two occasions for the Ringo color
snare on Ebay and I went as high as $400, then found out by email he wants $600 for it. It has been listed three times at least and I think he is asking more then the market can handle. Most people know Ringo with the Oyster Ludwigs and not the Premiers.
Premier has some of the best Chrome on vintage drums, so I would be suprised about the pitting. In regards to year they made them longer, but I only had the 62 catalog as a reference.
As long as it is not fighting any elements like salt or water, the chrome should not keep pitting. Salt could be sweat and touching the drum a lot with hands.
You can hand clean it with any automotive grade car polish. I use a product called Flitz and it also protects the chrome.
I have an extensive article on the web site about cleaning vintage drums
[color=#800080]http://www.vintagesnaredrums.com/how_to_vintage_snare.html[/color]
David