It's a 6-pin Ruko series 600 (probably local to Denmark). The cylinder was reset (pins changed) as part of the apartment take over, but theoretically the janitor could have fixed a copy for himself.<p>I'm probably not perfectly secured against a motivated thief, but he's not interested in me. He'll find a three year old MacBook (if I'm home, which I'm probably not), a lowend 37" LCD TV bolted to the wall and a few bottles of good scotch in the cabinet. If I had a collection of fine arts or other valuables, I'd be better secured.