Next, let's take a look at some very cool flange signs!
This is the earliest example I've found - the Diamond Gas - Oils flange from the 1910s.
photo: John O'Hern
Here is a Diamond 760 Motor Oil flange from the mid 1930s.
This Diamond Kerosene flange is from the same era.
photo: Maurice Campbell
Here's another version from the same period, but from a different manufacturer.
photo: Dan Matthews