Chesterfield Cigarette Ad

Neon sign I picked up off eBay many years ago. Having difficulty determining its worth but appears to be a 1930-40's ad targeted at women using the high fashion hook. Approximately 20''x14" and 5" at the base where the transformer is located. The ad is a mirror film over a paperboard backing in which it was designed to be interchangeable via a slot in the top of the frame. Great piece.