In this blog post, Sachs describes his collection of 1950s to 1980s rear derailleurs, collected over the years in new condition--with the original boxes---that he is now offering for sale. It's an amazing collection that he says is the most complete in existence, and we don't doubt that that's in fact the case.
Cost? Just $14,000 will, in one fell swoop, make you the owner of the most complete collection of Campy derailleurs from the classic era, from Gran Sport to Nuovo Record.
Here's a link to larger versions of the photos above. Lots more at Richard's blog post.