It's definitely a restorable piece. My name is Howie Cohen, and I run a sign company in Utica, New York, called Just Neon Sign Co., and I've been doing this since 1993. The techniques are the same.

Signs at 30 Rockefeller Plaza and the Apollo Theater are among the latest to lose their vintage glow in favor of LED lighting. Neon lettering on the vertical sign and atop the marquee at the ...