The Antique National Carbon Co A.A.R. Signal Cell Porcelain Battery Crock Cover Lid is a unique and historically significant collectible item from the railroad industry. Made of durable porcelain, this cover lid was designed to protect the battery for the signal cell, providing a nostalgic glimpse into the past of transportation and communication systems. The emblem of the National Carbon Co and A.A.R. adds a touch of authenticity and charm to any collection of railroad memorabilia.