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Welcome.
Your reference to R-8 suggest your are using a guide that was last updated in 2009.
"Majority are R-8 to Unique's."
Values and rarity may have changed considerably since then. There have been many hoards found and chips that were once considered rare or unique are now common to scarce.
With a collection as valuable as yours and to get a clearer sense of the current market it would be wise to invest in the most up to date guide available, The Chip Rack, 16th Edition... http://www.thechiprack.com/
Please post scans! 
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