Just out of idle curiosity, I've just filled a bored moment by weighing my working basses:
Ibanez BTB six - 10lbs 6oz
Sire V7 - 10 3
P bitsa - 10 3
Wal Pro 2E - 10 2
ska Jazz - 10 1
Shuker - 9 7
Thunder 1A - 9 7
fretless Ray - 8 14
No surprise that the biggest bass is the heaviest, but a couple of surprises. The T1A feels far heavier on a strap than it is, and the Shuker feels lighter. Perhaps it's to do with the balance? The Shuke is perfect, while the T1A neckdives like a bastid.