If the 65 is truly as described, I'd have zero issues spending $600 (and even a little more) were I a collector, and I think the market would easily bear it, too.
One question: if we're discussing the 65 in the picture (upper left), that model usually shipped with magnas, not target grips; if the purpose of the purchase is an as new, factory original 65 for collecting, might want to find out about those grips first.