My vote is the Trangia spirit stove. This stove has been around for a long time wikipedia say first sold in 1925. http://en.wikipedia.org/wiki/Trangia.

It has only 1 moving part, the simmer ring for controlling the heat output.A screw on lid so you can keep your left over fuel.

Weight is about 3.5oz for an empty burner. Needs a pots stand and windscreen. Clickstand makes a lightweight version of the potstand, weight 3.3 oz.

Thats my 2 cents