Gallery: Vintage computers on the auction block Summary: Michael Bennett-Levy's private collection of early technology was auctioned at Bonhams in London this week. See what they sold for. By Andy Smith | October 5, 2009 -- 07:34 GMT (00:34 PDT) Previous | Next Image 5 of 7 A range of early calculators are also part of the collection. These 56Hz bandwidth red LED calculators from the 1970s are expected to fetch £200-£300. This was not sold.Photo credit: Bonhams Topics: CXO, Hardware Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.