Very interesting,
One of my best friends has a similar Schwinn tandem track bike that still has the original green metallic paint and decals. I think it is 24X24. No chrome. It was built for the '64 olymics in Rome and was originally sold at Kissena Cycles in NYC. It has been converted to a road bike, but I'm pretty sure he still has all of the track parts including the 1" pitch chainrings. It can be purchased for around $1K plus shipping IIRC. Contact me off list if interested. Bike is in Texas.
Keith Kessel
Shreveport, La.