With two Google-powered smartwatches currently on sale, and the circular Moto 360 already causing a stir among design geeks, wearables are one step closer to securing a place on our wrists. And while many of us aren't ready to strap on a Gear Live, G Watch or Pebble just yet, that doesn't mean the smartwatch is a new concept. In fact, depending on your definition of "smart," these gadgets have been fusing time-telling with extra functionality since the early 20th century. From wrist-borne spy cams to radio-controlled timepieces, here's a look at this wearable's evolution.

Gallery | 14 Photos

A century of the smartwatch in pictures