need help !!

hello dear friends
I would like your help to that matter :
I have fund an Omega Louis Brandt perpetual calendar from 1991 and would like to buy it !
My problem and question is that , from my knowledge this watch has either the calibre 1116 or 1118, instead
the watch I am looking has the calibre 2890-9 !!!
thiis is the equivalant of above calibres ! So what is happening with this perpetual Omega ??

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