Apple Watch goes on sale worldwide amid supply shortage

By Bill Rigby SAN FRANCISCO (Reuters) - The Apple Watch goes on sale around the world on Friday, the final stage of a protracted launch of Apple Inc Chief Executive Tim Cook's first new product, capping months of publicity and a frenetic two weeks of pre-orders. Buyers can take the smart watch home from a handful of upscale boutiques and department stores, such as The Corner in Berlin, Maxfield in Los Angeles and Dover Street Market in Tokyo and London, which Apple courted to help position