Schwinn never took advantage of their position in the early mountain bike market. Most of the early mountain bikes were based on the early Schwinn balloon-tire bikes from the 1930's and 1940's. This was their attempt at a mountain bike. Remember that this was the first year of the Specialized Stumpjumper and Schwinn was offering a Varsity frame (looks like filet brazed but it is Electro-Forged) with BMX parts. It took them several years to realize that mountain bikes weren't going away and make a more serious off-road bike. This example is in near pristine condition with all original parts except for the seat.
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More MOMBAT-themed resources.
Mountain Bike Hall of Fame
Charlie Kelly
Vintage Ritchey
Cunningham
Vintage Trek
Vintage Cannondale
Fat Chance
Yeti
Mantis
Vintage Catalogs
"I’ve seen mountain bike rides transform people – not just their bodies but their way of thinking. Their spirit." Charlie Cunningham