As for the Dimaggio (batting) with a coupon. You should had bidded in the last BST auction
They had one SGC 30/2 and sold for 17,250.00
http://www.bst-auctions.com/1934_Zee...C_3-LOT16.aspx
I used to have one myself -without tab. Sold it to another member here. Fyi, many consider it as a pre-rookie card
As for the Gehrig 1925 Exhibits...I was looking for one of those for a while and gave up.
The only one availabe is on Ebay that is 707 Levi's and the lowest offer he take was i think 4100 on the Bestoffer.
http://www.ebay.com/itm/191013345033...%3AMEBIDX%3AIT