This is a very uncommon vintage watch known as the Omega Speedsonic F300 with a lobster Omega bracelet. This watch is very hard to find, especially complete with box, papers, and original hangtag! The case measures a massive 46x43x14mm in stainless steel with an incredibly cool, full-length lobster-style Omega bracelet that actually flexes like a lobster tail. This bracelet would cost a fortune to produce in this era. The F300 Omega quartz chronograph movement was just serviced and working perfectly. The dial literally changes colour depending on the reflection of light. The dial changes from bluish to black to silver. Look at the massive, rectangular, round-edge pushers. The hinge on the original box has dislodged, but opens and closes fine and looks great. These watches were marketed to Europe (Italy) and South America and are rarely seen in North America.