Well i finally hit the big 3 0. I found this dw5900 for £9.50. From the description i couldn't tell if the module was faulty or the battery was dead. I bought it anyway. After a removing the strap and bezel i gave the case a good scrub and found the crystal was like new. With a new battery it fired up no problems. I fit a new Brazilian bezel and new Casio 5900 strap, the thing looks as good as new.