Hi! all I remember this well! It originated in the UK and is a monitor stand with joystick/mouse extention cables I bought one new many years ago and it cost me a small fortune for postage. You could put your external floppy on the shelf and it made the 500 look ever so tidy, ended up going to my brother in law who still has it tucked away with his treasure trove of amiga gear.On thinking more about it I bought it from "Datel" or Analogic computers about 16 years ago in the years of madness and mayhem.