Hi Al, Rob, etc.
Great to see some truly amazing pics. It looks like Rob has the black backgrounds pretty well covered! I can't add a whole lot to the Giants button theme but thought I'd drop this odd-ball on the thread. Dr. M has the Red Sox version of this square pin and it's a really neat one in a weird baby blue color.
Scott, I have an early 70's Vida Blue at home that I'll locate later and post.
In the meantime, here's a site with a bunch of my buttons pictured. Please forgive the amateur nature of the layout. I'm no techie!!
http://andysvintagepinbacks.homestead.com/