Domed glass over the front helps to float the hands above the brand logo backing. Double Bubble clocks, made from the 1940s to the 1960s, are well known for being the most attractive of all the advertising clocks. Each of our clocks are just as beautiful as the originals! The clocks get their nickname, Double Bubble, because there is an inner crystal or glass bubble which displays the company logo. The hands of the clock are sandwiched between an outer crystal or glass bubble which usually displays the numbers of the clock. Limited production on many clock models is the rule, rather than the exception. Look for our clocks to become as collectible as the originals, once they are sold out. Size/Dimensions: Not Available Type: Home Accents Color/Finish: Multi-Color