From "Dopey" on the Schwinn forums;
"When the LT IV came out around Christmas '78, it sported two brand new colors, Frosty Blue and Strawberry Red. But by the time Spring came 'round, trouble with the pigments had already caused Chicago to drop those colors and fall back on trusty ol' (and boringly ubiquitous!) Sky Blue and Cardinal Red."
Your darker blue was the Sky Blue. I have seen quite a few cases of bikes of a certain year in a color not specified in the catalog. The catalogs were produced during the previous year and sometimes changes occured to the bikes that actually went into production.
Last edited by Sierra; 07-10-06 at 10:43 AM.