Omega 145002 Movement question

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Hi

Happy New Year, albeit a few days late 😀

Im quite new here and am struggling to find some info

Been offered a 145002 with a 48 mil serial which Im told dates to 1985 but guy says its a cal 1861 which I thought was introduced in the 90's

Can someone shed some light or point me in the right direction on calibres etc

Thanks in advance

Marc