Omega Speedmaster Automatic Chronograph. Available in a large selection of different dial color / meter color / bezel options. Double locking clasp mechanism with embossed Omega logo. Fully automatic, sweeping second hand movement. Functional incremental Chronograph dials. Hack Mechanism - second hand stops when crown is pulled out to set time. Solid Omega wave pattern SS back, with Omega Broad Arrow Markings. All the appropriate OMEGA markings.