What’s that sign font? It’s likely not a font at all. If not custom lettering, it may use prefab letters from a specialist supplier. These products were often used for mid-century buildings. Some styles are inspired by printer’s typefaces, but they are usually unique designs specifically for the architectural market.
Catalogs from these suppliers are tough to find. Fortunately some are available on @internetarchive, so I made a list: https://archive.org/details/@stewf/lists/1/prefab-architectural-letter-catalogs?sort=creator






