Possible Clues:

• Innumerable - secret
• Perhaps no relation to the old nut
• Sounds as if the bell is silent to an immense extent
• An awful lot of familiar stories couldn't be this
• No sound from the bell, to an extraordinary extent
• Silent bell is said to be enormous
• Not related, perhaps, to a bell that's not been rung, by the sound of it
• Unspoken - inexpressible - uncounted
• Beyond measure
• Very great stories shouldn't be?