KEF B139 (SP 1044) 50 - 100 watt Power Handling Bass Driver. Weighing about 5 Kgms boxed/drive unit their specifications are  :- Impedance 8 Ohms.
This auction is for one used and in excellent condition KEF B139 driver, I sold the other speaker in an earlier auction when I was offering them as a matched pair, but the buyer required one only, therefore the remaining unit is for sale.

This driver came from a pair of "Lentek" monitor speakers that I bought new. They were excellent speakers but the "other half" said they had to go because they were too large for the house, so I disassembled them, dammit ! There isn't any damage to them whatsoever.