https://stampauctionnetwork.com/V/V810.cfmKelleher has a nice sale with a lot of nice material coming up. From time to time I notice errors in lot listings, at various auction houses, but I rarely bother to mention it unless I know the owner personally, and he/she knows me. Otherwise, any notice I might give tends to get either ignored, or generate hostility. Its not worth the trouble. I had a friend once, at a show, gently say something to a well-known dealer, and my friend almost got assaulted for pointing out an error that dealer made.
Anyway, I was browsing this nice sale, and I noticed not one, but two errors on highly valued items, so I thought I'd make a thread here for entertainment, and awareness. I am not placing any judgement on the seller, as some of these varieties are difficult to get correct.
The first victim is lot 3240 -
https://stampauctionnetwork.com/V/v8106.cfm#63Quote:
1851, 1¢ blue, type Ib (Scott 5A), single (in at top, grazed at lower left, small scissors cut at upper left, otherwise full- to oversize-margined), plus three #10 (horizontal pair plus single), all pen-cancelled with "South New Market/16/MAR/[1857 manuscript]/N.H." postmark alongside, on cover addressed to Petaluma, California; stamps fresh, the 1¢ with particularly bold color, Fine, attractive cross-country use.
Scott $3,460+.

So, the 1c stamp is clearly a Scott #7, Type II, and not a valuable 5A.
I'm a little fuzzy on how this got confused, but the guide dot at lower right, and overall color + impression and design completeness make this a fairly easy call. The stamp is probably from plate 2.
In addition, the 3c stamps are called out as being #10, orange browns, but this cover was used in 1857 -- the odds of this are astronomically low. It is highly likely that these are #11s.
The colors on the stamps are very attractive, and the transcontinental 10c rate usage is nice with this franking, but it isn't what it is described to be. In the synopsis of the sale at top, they mention that they have two #5A's in the sale. Well, only one - lot 3241.
The second victim is Lot 3262 -
https://stampauctionnetwork.com/V/v8107.cfmQuote:
1857, 1¢ blue, type Ia (Scott 19), exceptional color depth on pristine paper, sound with pen cancel, Fine.
Scott $4,750.
This one is a different category of error. This stamp is a Scott #22 Type IIIA that has been altered at bottom to appear to be the more expensive #19 Type Ia that it is being sold as.

The entire bottom half of the bottom ornaments has been drawn in all the way across the bottom of the stamp. This is to make it look like the ornaments are complete, which would be characteristic of a Type Ia, #19, which it is not.
Anyway, the purpose of my post, once again is for awareness, education, entertainment and not to disparage anyone.