Curtis Industries NOS Key Blank Lot Of 2 Uncut W1 Brass Tone Keys. These were produced between 1945 and 1964 when the company was named Curtis Industries, and was located in Cleveland Ohio from 1945 through 1960, then in Eastlake Ohio between 1961 and 1964. Keys are Brass, or Brass Alloy, or Brass Plated. Keys are stamped with their identifier. They are as found and have discolorations from age and exposure to the air. Look at all pictures as they show details of the condition and are part of the description. Shipping is by USPS Ground Advantage and tracking will be provided.