Has anyone ever seen one of these before - a clear Sinclair ZX Microdrive Cartridge, so that you can see the workings.

On ebay - 7th August 2009 to 17th August 2009.

I guess it was produced for promotion material to show the inner workings of the microdrive, although from memory, I don't remember a picture of one - just hand drawn diagrams....

Interesting!