This Mid Century Christmas light string is wrapped in its original coils, never used. It's wired for C-6 bulbs, but these bulbs are the more scarce miniature colored 8 volt bulbs, like those used in the old transformer sets (I believe they're E10 size). I tested a C6 bulb, and the string takes both types. There are 15 working bulbs, all of which light up brightly. The UL tag lists the brand as Reliance. The box the set came in may not be original. You know how it goes - in the hurry to take down the tree after the holidays, things don't always get put back in their correct boxes.