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Those 1950s Indian-badged Royal Enfields included practically every model the British company made, including the fast vertical twins. These seemed perfect for American conditions and appropriate, too, because, before it ended its own production, Indian had been building vertical twin motorcycles.
One of those "real" Indian twins just sold on eBay, in Ahwahnee, Calif. lovingly restored, for $11,975.
The seller noted that:
"The 1949-1952 Indian Scout/Warrior series is the only parallel twin ever manufactured on American soil. These overhead valve motorcycles were built by Indian in Springfield, Massachusetts, in an effort to compete with the British offerings of the day. Do not confuse these motorcycles with the re-badged Royal Enfield motorcycles that were imported in the late 1950s."
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It is a fascinating, if confusing, period in motorcycle history.