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Are "problem" coins in slabs also net graded and why?

I'm an average grader (that may be the problem) yet several coin club members agree that we are seeing more numbers of coins in "detail" slabs that are under graded - especially dollars. For example, really detailed AU (55+?) cleaned Morgans graded XF45+ Cleaned. I though net grading was only done with straight graded problem coins.
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Where are you seeing numerical grades, such as XF45+, on details slab labels?
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I’m not seeing that phenomenon to any greater degree than for straight-grade coins. Both detail-grade and straight-grade coins are subject to loose, as well as tight grading.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
Cleaning affects mint surfaces and especially with processed coins you can get a disconnect with the details/wear and the fabric of the coin.
This is because with PCGS and CACG (more so than NGC) standards, The AU grades are more so a testament to intact mint surfaces percentage than wear.
11.5$ Southern Dollars, The little “Big Easy” set
I've only seen it on the new(er) ANACS holders but never PCGS or NGC.
Sorry, typo. No +'s. I'll find out how to take a phone picture and post one. I see the "attach image icom and some guys in the club meeting can show me at next month's meeting.
Old ANACS used to do it, if there wasn't an indication on the label, there was a digit in the barcode for an indicator.
ANA 50 year/Life Member (now "Emeritus")
Here's an example.
This 1799 cent is in a straight grade VG-08 holder. The grade is VF sharpness downgraded to VG because of light corrosion. Why? It's a rare and popular date with small supply of available coins. It filled the hole for me without having to take out a mortgage to buy it.
I tried buy a clean Fine-12 graded piece in an auction. One other guy took the price to moon, over $30,000, which is par for the course for me.
This piece works for me because I can read the date. Collectors pay thousands of dollars for 1799 cents without a date. How does that happen? If you look at the reverse, there is die lump between "E" and "T" in "ONE" and "CENT." That's been called a "mint mark" and it's an indicator that the piece is a 1799 cent. I saw a frugal New England dealer write out a $1,600 check to a collector who had cherrypicked one of those coins. That made an impression on me.
Yours is an example of a net graded coin. What I've seen is a coin like this VF COIN in a slab graded VG & environmentally damaged - net graded and problem graded also. I don't like either, but I guess it is the market. I'll bet your 1799 would clean up very nice in the right hands.
That coin would not "clean up" at all. Copper is not like silver and gold. Experts can mess with that, and the results can be credible. The copper coin would look worse than it does now.
Revised to add this comment.
You hear the line, “If old you could remove the corrosion, there would be a great coin under it.” The trouble is the coin is MADE OF the corrosion. If you remove the corroded surfaces, you don’t have a coin.