The L. Kurzrok M.D. stamp reads as follows:
L. KURZROK M.D.
9 E. 96 ST. N.Y.C. 28
Dr. Lawrence Kurzrok was a pre-eminent collector along side such notable names as Burdick, Carter and Bray. He had amassed a collection of over 5 million cards including over 2,000 Old Judge examples in his day. His collection spanned all types of collectable cards, but his baseball cards were his favorites.
Dr. Kurzrok enjoyed all his cards stating that, "The knowledge printed on these cards is so great you can't help but learn from them - You can learn anything from how to build a house or make a window frame to the names of the Kings of France."
He was an avid stamp collector and then got into coins, but cards became his true passion. He believed in collecting so much that he spoke in front of groups trying to raise money for collecting clubs in high schools and colleges.
One of my favorite quotes I read from Dr. Kurzrok was this: "As the work week becomes shorter and paid vacations become longer, it becomes increasingly more difficult for individuals to find something to do with their spare time." This was from an article in April 1973. Sounds nice now, but I find the exact opposite situation for myself these days with longer hours of work and less paid vacation time to fill with my hobby.
He was a practicing physician in NYC until he retired to Longboat Key near Sarasota, FL in 1971 and passed away in 1976. While in NYC he was the President of the Card Collectors Society of NY. He hosted meetings at his home at the 96th Street address noted in his stamp.
After he passed away, Rob Lifson purchased the bulk of his collection, and it was dispersed throughout the hobby over time.
I enjoy having cards with provenance like my Lionel Carter cards (and I once had a Nagy card) and have been lucky enough to acquire an example of this stamp from Dr. Kurzrok as well. Here is a link to some more info from the exceptional blog "The Topps Archives".
