Watchdives makes 4 homages of the Omega Speedmaster Moonwatch Professional. They are ranked here by how closely each follows the original.
Watchdives WD1863Chronograph, 41 mm, 1 mm smaller than the original, 4 reviews read
Watchdives WD1864Chronograph, 42 mm, same size as the original
Watchdives WD1860Chronograph, 40 mm, 2 mm smaller than the original, 1 review read
Watchdives WD1863AChronograph, 41 mm, 1 mm smaller than the originalThe original
Omega
Speedmaster Moonwatch
Reference 310.30.42.50.01.002, steel case and bracelet, sapphire crystal front and back