That design was introduced by Shimano (and Schwinn) in 1971. As described in the '72 Shimano catalog, alternate teeth were used on the largest two cogs in the 14-32T or 14-34T wide-range freewheels, which enabled significantly faster shifting onto the large cogs: Shimano Bicycle Parts - 72 page 12

Schwinn used these freewheels on the Sports Tourer and World Voyageur/Voyaguer II