This is a reconfigured Olivetti typewriter by Tauba Auerback in 2005. In addition to being modified with enamel, the keys have been changed to fit a new code.
“Auerbach often bases her work on these sorts of solvable codes or systems. In one of her works, a series of reconfigured typewriters, she alters the keys so that their letters and symbols no longer correspond to what appears on the paper. The typewriters are painted with clues to the logic of their new operating systems; once each code is cracked, the machine becomes functional again.”
[Via]