Probably a first world problems tweet, but I just picked one of these Heath-Zenith Westminster-chime doorbells up for £25, thinking it was mechanical, and probably easy to modify to work from a wired doorbell setup.
Alas, it's electronic - the brass tubes are completely hollow :(
@renbymon You're telling me :( The quest continues... I'm looking out for a Friedland Westminster, anything but a 1- or 2-note should have the chime. They have a little motor mechanism which sequences the bells - which is really cool!