The 1970's Schwinn Super-Record Tires were made in Japan, either by IRC/National, or by Panaracer (does anybody know for sure?)
Panaracer Pasela skinwall wired-on tires (non-Tourgard) are still made in Japan and make a good modern-day replacement. The regular versions have are supposedly more comfortable than the tourgard kevlar-belted versions. The regular versions are the more "period correct" tire to buy. Your LBS should be able to get them in gumwall black/tan with a steel-bead.
amazon has them in 27 x 1 1/4 tree fort has them in 27 x 1 1/8
http://www.google.com/
- Don Gillies San Diego, cA, USA
P.S. sometimes you can find NOS schwinn super record tires on ebay. Be careful, though, as some of these are heavy 480 gram tires, and some are the light ~300 gram skinwall tires, and you probably want the latter.