Most advertising was mass produced. The smaller companies that advertised on smaller scales would have produced
less signage therefore making it more rare than the mass produced stuff.
How many survived over the years would also determine rarity.
For instance there are several Pan-Am porcelain pump plates out there, but almost no Pan-Am "Commando" Tin pump signs.
The porcelains are older.
Keep in mind though rarity does not compute to dollars.
It is desire that fuels that fire.
I have a globe that may be the only one left in existance but it is not valued as much as some of the mass produced
"popular" oil company globes......"perceived value"
To me, the globe is priceless, to some worthless.
