Yamaha PB-1 preamp. These were originally sold in the 80's and early 90's and have quite a following, and it's easy to see why. Build quality is superb (the unit will outlive the buyer).
Used by the likes of Tony Levin, Jeff Berlin, Billy Sheehan and JJ Burnel.
Good cosmetic condition, everything works as it should. 110V unit, so you'll need to budget for a low power 240/110 adapter (available on ebay for under £4).
Looking for £75 plus postage.