Sheldon,

I purchased a used $5 HNO on eBay years before the HNO dig chips . It was a pricey chip and paid couple hundred . It was either From Jerry Wall's or Bill Akeman's collection . Purchased from Bill Akeman when he was selling on eBay years ago and many years before the dip chips . So they are $5 pre dig chips but didn't see any $25 or $100 could have been in collections at that time .