Yes it could.
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What it means is that your original dealer is a cheapskate. Yes, if you placed a really high-powered magnet right adjacent to the cartridge it could damage it, but this would almost have to be intentional. And I seriously doubt that he took the time to test each coil on each NOS cartridge he sold! Caveat Emptor applies here, for certain.
Correction from above where I mentioned the reading was output volts. It was micro-ohms.If that is what the person told you, he absolutely does not know what he is talking about. 0.8 micro-ohms is for all practical purposes an unmeasurably small amount of resistance, and is more than a million times smaller than the resistance of any cartridge coil that I am familiar with. It is also something that would be unaffected by a magnet, as Rodman indicated earlier.
The only sensible interpretation of the 1.3 and 0.8 figures seems to me to be the output of the cartridge as measured in millivolts (mv), for the two channels respectively, when playing a standardized test track.