Firestone Signs

[mockingbird812]

My favorite local tire shop is closing and moving into more modern facilities. During my last stop in the shop this week I asked the manager what he was going to do with the two "tin" Firestone signs. I was glad when he offered them to me as they would be putting up new signs. These signs are white lettered with red background and are 20" tall by 10' wide. There is no framing around these. Can the sign-experts tell me how old these may be or any details to look for?

Thanks.