I'm guessing my Locomotief Populaire weighs more than 60 pounds. Most of Holland is flat, so weight is not a big concern there.

Drum brakes, Sturmey 3-speed, an ignition-style key lock (key must be in bike for it to roll), and I alumin(i)um hadn't been invented when it was made, because the rims, hubs, seatpost and handlebars are all steel.