Pennzoil from my nephew

I love old signs. I went to visit my sister in the Upstate earlier this week, and as she was showing me around her house, I saw this sign sitting on the floor of one of the bedrooms that's used for storage. It was my nephew's, and he got it at a flea market about 15 years ago. She called him and asked him if he wanted to sell it to me. He said he forgot he even had it since he moved away about 12 years ago. It's just been sitting there on the floor all this time. Anyway, he gave it to me! How awesome is that. I've been after one of these signs for a long time. It's double sided and is dated 1957. Maybe I should visit my sister more often. :)