Is there a sleeve all the way through the top tube or is it just entrance/exit holes? With respect to the internal routing being on the wrong side, my first thought was some custom (or later addition of brake cable routing by someone who hadn't had their coffee yet) cross bike with internal routing for FD cable for a top pull FD, but the frame is probably too old for that and looking down I see downtube braze-ons for the shifters, so that's out.