THIS IS AN OLD ADVERTISING WOOD RULER THAT MEASURES ABOUT 12 INCHES LONG. THE RULE FEATURES “STANZEL’S SUPER SEALER-WORLDS BEST STOP LEAK”. THE PRODUCT WAS A COOLING SYSTEM LEAK TREATMENT FOR AUTOMOBILE ENGINES. IT ALSO WAS A RUST INHIBITOR AND WATER PUMP LUBRICANT. MADE IN DES MOINES IOWA, A NEAT OLD GAS AND OIL ADVERTISING ITEM