The Curt Teich Postcard Archives are a valuable resource if you collect any Curt Teich series, V.O. Hammon cards, or even Century of Progress postcards. They have over 5,000 V.O. Hammon postcards, 3,000 Century of Progress postcards, over 100,000 Curt Teich cards, and more. The archives are actually in Libertyville, IL, and researchers may request different images and lists for a fee.
On the website there is also a guide for dating Curt Teich postcards. Take this Ocean City postcard- on the bottom right there is the code 8A-H2266. By looking at the guide on their website, we know this card was published in 1938, because it falls under 8AH1 – 8AH3291.