"True" T206 rookies backs?

[brianp-beme]

Originally Posted by h2oya311

There’s only really one “rookie” in the t206 set. Marquard (hands at side) with a 150 back (or other backs that coincide with that 1909 date). Some might argue Speaker’s rookie is the t206, but there are some 1909 issues that pre-date the Speaker, which doesn’t come in a 150 back. I believe Speaker only comes in the 350 or 350-460, issued in 1910 and 1911 respectively.

Just my opinion and doing this from the top of my head, so please forgive any errors I may have made.

Here's a question...since Zach Wheat was printed in the 350-460 Series group in 1911, what is his earliest card/card-like thing that has a (at least somewhat) confirmed printing date, and not just a range of years?

Brian