Must have been a really old desk
And a really BIG one since there is over 300 of them.
Actually, I had put them in a box that over time has managed to make it's way to the back, forgotten areas of my workspace. Most are shipping related, a few lighthouses, local and misc.. but all are very old starting at 1905 with the newest one postmarked 1964. It was fun looking at all of them again.
I had the big idea of scanning each one and making a digital library of them but that will take some time to accomplish.