The picture shows a close view of this Old Duo - Therm Home Heater Tin Advertising Clicker / NoiseMaker. It is made of tin and reads:
Snappy Weather Ahead Buy Your Duo-Therm Home Heater Now! It measures 1-3/4" x 15/16". It is in excellent condition with only very light wear and a tiny spot that might come off with cleanning. I will leave that to the buyer.