Are we on the same page?
This is the rating system I got from the KEH site.
They have one 500 ELX rated at Ex for around $425.00
There rating for Ex should be more like Fine.
I would imagine one rated at Like new - perfect would run at the six or seven mark.
You think?

NEW As packaged by manufacturer. Manufacturer’s USA warranty. Never used or owned by a consumer.

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NEW DEMO As packaged by manufacturer. Manufacturer’s USA warranty. Never owned by a consumer but used as demonstration equipment. May show various stages of wear including slight dings or pecks.

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LN "Like New" Perfect. Includes original box and instructions and any manufacturer provided accessories.

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LN- "Like New Minus" 97-99% of original condition. Extremely slight wear that can only be seen upon very close inspection. Box and accessories not included.

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EX+ "Excellent Plus" 90-96% of the original condition. Shows moderate wear. May have slight marks on finish. Glass very clean.

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EX "Excellent" 80-89% of the original condition. Shows moderate wear. May have small dings, pecks and slight finish wear. Glass may have some dust, but no marks.

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BGN "Bargain" 70-79% of original condition. Shows more than average wear. May have dents, dings and a goodly amount of brassing and finish loss. Glass may have marks that should not affect picture quality.

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UG "Ugly" Very rough looking. Multiple impressions in metal, excessive finish loss and brassing are likely. Glass will have marks, fungus or haze that will probably affect picture quality.