Jeanne Bridges picks this CD 102.4 as the favorite insulator from her collection. 102.4's are tough enough to come by, but this one's special attraction is the enormous bubble that is open at the dome. You can actually place your finger tip inside the bubble between the glass wall of the insulator and the threads. Yes, the threads are intact. How they survived when there is nothing but air space behind them is anyone's guess. 

Once again, a collector selects an insulator with special character as their favorite Crown Jewel.