This vintage Humble Oil Refining Co. mechanical pencil features the unique advertising concept that incorporated a tiger into its design and use of the slogan "Put a Tiger in Your Tank", making it a standout collectible item. With a multi-color theme and original creation, this pencil harkens back to a bygone era of gas and oil advertising in the United States. Perfect for collectors interested in memorabilia from the oil industry, this pencil is a quirky and nostalgic piece that adds a touch of whimsy to any collection.