Its interested to read discussions about reproductions and not see more people questioning the legitimacy of the fonts as a telltale sign that signs may not be original.
If you look closely at hawkike's post which has an image of two Signal signs, note how the fonts appear similar, but are not exact.
For example, focus on the "A" in gasoline. Note how the sign on the left has crisp edge corners, but the sign on the right has slightly rounded corners. Now look at the triangle inside the "A": note how they are of different sizes.
