[rookiemistake]

Recently, I became curious about the stamp that is on the back of one of my cards. After some research, I found a website that has already done research on the topic. I just want to get members thoughts and or opinion/s on my assumption.

The website claims that Jefferson Burdick (who wrote the American Card Catalog (ACC)) himself would stamp some of his cards with his stamp. Website show 3 different stamps (on back of cards).

I compared the back of my card to the examples given and found one stamp to be very similar. The first example on the website is similar to my card. Any thoughts about the assumption that this card was one of Jefferson cards?

Thank you.