Similar names can describe different references. These two OMEGA Speedmaster Moonwatch configurations retain their complete reference numbers: .001 identifies the Hesalite version and .002 the sapphire version. A canonical reference is separate from any individual owned watch. See the manufacturer sources on each reference page.
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Watches
OMEGA Speedmaster Moonwatch
Reference 310.30.42.50.01.002
Reference model · condition is object specific
OMEGA Speedmaster Moonwatch Professional, reference 310.30.42.50.01.002: the 42 mm steel configuration with sapphire crystal. The full reference distinguishes it from the Hesalite configuration ending in .001.