A three-speed transmission was offered for the 1915 Harley-Davidson models.

1915 Harley-Davidson 11F Pictures

The 1915 Harley-Davidson 11F motorcyle was equipped with a fuel tank that performed double-duty as the oil carrier, and boasted a shifting mechanism that had a gated guide plate.

Electric lighting was newly available, but this model is equipped with an old acetylene system.

An exposed valvetrain was common in the era, and was fascinating -- and often messy -- in action.

This little tyke is no doubt dreaming of the day when he can ride a motorcycle of his own.

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