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Hard to tell from the photo, but I'm assuming this is a lighted sign that predates the age of digital fonts. Most likely custom-made to accommodate a continuous string of lights.
The following are similar monoline script fonts, though no exact matches to your sample.
http://www.myfonts.com/fonts/filmotype/lucky/ (with stylistic alternates)
http://www.myfonts.com/fonts/sudtipos/cuisine/ (with stylistic alternates)