In the song "Women's Rights", what is the "Silver Bill" the song's talking about? From context, this seems to be some law about women's right to vote. However I've searched the web for this, and the only "Silver Bill" references I can find are all about coinage.

My wife's planning on singing this in a few weeks, and it'd be interesting to know the background to it. According to the DT the song dates from 1942, by which time women were already voting! Or is this an older song written at the time of the suffragette movement which was only collected years later? And what's this law?

Suggestions on a postcard...? Or more usefully, posted below... :-)

Grab.