What does net grading mean? And is it still used by the TPGs?

Every now and then I come across a coin often in an OGH that someone describes as net graded. Draped Bust, Capped Bust, old gold coins, etc. I assume it means downgraded. But for what? Very old coins have mostly been cleaned at one time; is that net graded even though it doesn't say so on the holder? Do the TPGs still do this? Or is it something that was done 20 something years ago and the coins have not been re-holdered? Thanks for the input.
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<< <i>Thanks, TDN. But when did they stop this practice? >>
They didn't completely - though about when CAC was created all parties were making an emphasis on cracking down on doctored coins - the noose tightened a bit then.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
<< <i>Is net grading similar to market grading?
Not really but a little. Market grading is the premise that a coin will sell for MS65 (for example) money due to some positive attribute so we'll go ahead and grade it that even though it might technically be a 64.
One of the coins I showed was a 21S walker in an ANACS XF40 holder. Rick Montgomery was the expert I consulted.
When I asked if the coin would cross, his words were "the coin has XF details, but appears to have been lightly wiped on
the obverse, so we would likely net it as a high VF grade". So I think this may help answer both of your questions.