Potentially fake D350-3 Standard Biscuit backed cards on eBay

[Fred]

I was getting confused reading the thread. Is the D350 in POST 9 the "suspect" card?

A little research seems to indicate that these cards could have come with blank backs which allowed advertisers to put their own stamps on them. If so, how much more $value does the "Standard Bisquit" stamp add to the card (as opposed to a blank back version)?

In an effort to educate myself on the D350, I went to the Old Cardboard website and found the following info:

Subset Name D350-1
Year of Issue 1916
Card Size (inches) 1-5/8 x 3
Num. of Cards in Set 200
Cards Numbered? yes yes no
Related Sets: M101-4, D329, H801-9


D350-2
Year of Issue: 1917
Card Size (inches) 2 x 3-1/4
Num. of Cards in Set 200
Cards Numbered? yes
Related Sets: E135, D328, H801-8



D350-3
Year of Issue: 1921
Card Size (inches) 2 x 3-1/4
Num. of Cards in Set 80
Cards Numbered? no
Related Sets: E121, D327

Note: The D350 Type 1 and 2 subsets are listed in the American Card Catalog and in the Sports Collectors Bible with Type 1 as an 80 card set of "large" (2 x 3-1/4 inch) cards and Type 2 as a 200 card set of 1-5/8 x 3 inch cards. The sets as defined above are consistent with most hobby checklists today but are not consistent with the descriptions in the ACC and SCB.

I'm no expert on this issue but if I were to guess, I'd guess the cards in POST 4 look suspect only because the stamps appear to be very "light".