$600.00 is definately not too much for that sheet as long as there are no gum issues or other faults....creases, finger prints........not trying to nit-pick but anyone spending that much would probably want to know. Posting large clear photos of both sides would reduce any hesitation a buyer might have and could increase bids if the sheet is in great condition.
I personally will shy away from sellers that do not show both sides of single items and small groups.
Good luck with your auctions..........and let us know how to find your items.
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