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As @JB said I think the only difference is the sapphire back and front rather than hesalite and solid case back.
As @JB said I think the only difference is the sapphire back and front rather than hesalite and solid case back.
This https://www.beaverbrooks.co.uk/0103836/OMEGA-Speedmaster-Moonwatch-Professional-Chronograph-Mens-Watch/p
vs
https://www.beaverbrooks.co.uk/0010263/OMEGA-Speedmaster-Moonwatch-Professional-Chronograph-Mens-Watch/p
Spendier one seems to have an open caseback.