I've found a lot of these lately, and thought of how many I've thrown away. They're mostly on brown boards, found in printers, copiers, VCRs, etc, etc, etc. Most I've seen are on brown boards, but, if you pop the top off of the push button, there's a little springy insert, that's usually gold on both sides. Are these actually gold? or just the older ones?
http://upsimple.com/uploads/anonymous/100_5698.jpg