Vintage Typesetters Tray
You need one of these vintage typesetter or printer's block trays!
I use mine to display my collection of vintage typesetting stamps.
Each tray is vintage so exact size may vary but they are roughly 16" L x 2" W x 35" H. Since these are true found items they may differ slightly in color, design and cubby size.
Photographs provided by Jess (@houseon77th).