Vintage Set Of Edwards Model 340-6FX 340-4FX Adaptabel Audible Signal Bells - 2 bells! We pulled them off of an old warehouse building in 1981. They were hooked up to the telephone lines so you could hear the phone ringing from anywhere no matter how noisy the environment was! We?ve had them stored in a box ever since then. They are great for school bells, telephone, alarms, and many other applications. Approximate Measurements as seen in pics: 6FX - 7? base diameter x 3? height 4FX - 5.125? base diameter x 3? height Specs: 18 volt. .45 amp for the large bell. .49 amp for the smaller bell. 50/60 hertz. Please see all pics! No dents, dings or cracks. Paint missing in some spots with surface rust and some scratches present. These are solid metal bells. Thanks for looking and have a great day!