Here is a T206 with a stamp of prominent collector Lawrence Kurzrok, along with a photo. A writeup of Kurzrok is on this excellent website by our own Andy H. about T206 back stamps:
https://thegreatt206backstampproject...kurzrok-md.php
Besides being a doctor and professor, as a young man Kurzrok was quite an advanced amateur tennis player in the 1920's and 1930's, at some point ranking 10th in the nation.
Brian