Ever notice this ebay restriction?
 

http://pages.ebay.com/help/policies/autographs.html

Trading cards

Having trading cards graded by a grading company helps buyers know the value of the card you're listing. When listing any of the below trading cards, the following information must be stated word for word in the listing and in the same font size as the rest of the description:

The seller has taken the appropriate steps to have this trading card professionally graded by a reputable grading company.

The seller needs to include a clear photo of the graded trading card, showing the name or logo of the grading company.

Allowed

Most trading cards can be listed, as long as they're the original trading cards or authorized reproductions of trading cards. An authorized reproduction means a company has acquired the rights to accurately reproduce the original card.

Restricted

You can list the following trading cards only if they've been professionally graded by a reputable grading company:

1909 Cy Young (T206)
1909 Eddie Plank error card (T206)
1909 Honus Wagner (T206)
1909 Ty Cobb (T206)
1933 Babe Ruth (Goudey #53, #80, #144, and #181)
1933 Lou Gehrig (Goudey #92 and #160)
1951 Mickey Mantle (Bowman #253)
1952 Mickey Mantle (Topps #311)
1966-1967 Bobby Orr rookie card (Topps #35)
1979-1980 Wayne Gretzky rookie card (O-Pee-Chee and Topps #18)
1986-1987 Michael Jordan rookie card (Fleer #57)

???
 

I guess the sport of football has no iconic cards worthy of this admonition?

yes. i have mentioned this in the past but not remembered the link to it.

kevin

Did they really refer to the T206 Plank as an "error card"?

I think "reputable" is a subjective term.
There are so many fakes (of all cards) it would take a full time team to do the job of ridding ebay of them.