Greetings Leon & All,
In 2005 or 2006 (I'd have to check my records?), I sold the only known SL Printers Proof(tmk) to a fine Gentleman who lives on Broadway in NY. As soon as He knew I had the card, he just asked "How much?" At that time, including the Proof I sold Him, He had 23 T206 Proofs!
I've always hoped that one day(like many others

I would have a shot at your Matty Proof...
imho... The Matty iS A Solid 28k... & I also believe that there would be a bidding war for it! So, who really knows...Right?
As for the Overprint, I also think that 50k is within reach because of the same issue that your Matty card has to bring to the block.
And... Unless your young lady has developed a passion for T cards(has She?), I also believe that we will see these on the Block in the future. And I personally can't wait for this to happen '
Dankz Again Leon fir sharing these Timeless Beauty's!