Omega Speedmaster Professional Moonwatch hesalite ref. 345.0022 question

Genst, I,m new to the world of Omega and looking for some background information about an Omega Speedmaster Professional Moonwatch hesalite ref. 345.0022, serial number on one of the lugs = 771940XX. I've found that information on this particular reference number is limited, probably I'm not looking in the right direction, so I'm asking you guys for help . The watch was serviced this year, would come with the original steel bracelet, without accessories, and according the seller was manufactured approximately in the year 2000. Pricing tag is around euro 4800,- Watch is located in Europe

Thanks in advance for your help, cheers
PKVLD