It looks like they're belts for an IBM "Executary" dictating machine. http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV4019.html You have a reference to these things on your own web site: http://www.richardhess.com/notes/formats/magnetic-media/magnetic-dictation-belts/ John Ross At 5/2/2007 02:18 PM, you wrote: >A person contacted me today with an approximately 5x8 inch magnetic >sheet with the IBM logo on it and two holes punched in that edge. It >appears to be magnetic material. We have no idea if it's audio (I >haven't seen it before) and I'm suspicious that it MIGHT be a word >processing format. It dates from the late 1960s and was apparently >part of some U.S. Navy documentation. > >A photo of it is posted at: http://www.donmarquis.org/ibm.pdf > >There are ten of these sheets in the collection.