This is an Omega Speedmaster Moonwatch Exhibition Back 3592.50, a pre-owned watch from 1992 with light signs of wear and scratches on the sapphire caseback.
This Omega Speedmaster Apollo XI 3592.50 is a special edition watch that celebrates the 20th anniversary of the first trip to the moon, featuring an open caseback with a gold-plated movement and high horology details such as côtes de geneve and thick glossy engraving.
This Omega Speedmaster Professional Moonwatch Chronograph features a mechanical manual movement and is housed in a stainless steel case with a 42mm dial size.