If you think $14k was high for the Gulf sign, check out this Mobil sign:
https://bringatrailer.com/listing/1949-mobilgas-porcelain-sign-with-neon/When I asked what assurance he could give that the sign was an actual made in USA vintage sign, he was evasive. Just stated that it is "dated 1949", as if no one in India is smart enough to date a sign 1949.
It may very well be vintage, but I would like to see a seller at least ONCE simply state: " I guarantee this sign to be made in the USA in _____ year".
Seems simple enough. The seller may be the most honest person on the planet, and the sign may be 1949 USA made vintage. I don't know him.
