So at first I didn’t even notice the vertical letterhead design. I’ve never seen a vintage letterhead that isn’t horizontal (they’re actually still a bit unusual in modern design). Anywho, it’s a great illustration of a city that spans the height of the page. With a small image size and passing glance, it sadly just looks like a blob- but I assure you it’s much more than a blob when you zoom in and see the detail!
P.S. These images are actually only 50% of the original size. You can view the full size images from their original source- The University of Washington’s Digital Collection. Direct Links: 1 | 2 | 3 | 4