I always saw Overstreets as a general sort of price guide for most antiques that was only marginally accurate.
Rare of any type will vary depending on the hobby. A friend collects movies on 16mm film. A super common one might get to 25-50 copies. And many, especially relatively recent ones the total produced is well under 10, often no more than 3 or 4. Surviving copies in good condition are even harder to find.
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