Sony Walkman nostalgia leads to a hot market for old technology

Roll tape. Back during the late 1980s heyday of the Sony Walkman, the parent company of the Apple iPhone of the era partnered up with Tiffany & Co. to create a silver-plated version of the personal, portable cassette player, in honor of the 10th anniversary of the absurdly-popular listening device. Only 250 of these special Walkmans were made, many of them delivered directly to some of music's greatest names. Today, long after the revolutionary technology was made obsolete, Walkman collector Mark Ip is the proud owner of not one, not two, but three of the Tiffany Walkmans — for which…