A printed Omega logo is correct for some of the earlier models. See last paragraph of this article. https://download1337.mediafire.com/bt66zw0ydg9g/ojf488dzh034yzk/Condialdefinitive+part+1V2.pdf
Beautiful and rare model, probably a Cal. 354 2648 or 2652 - they had the Omega text printed. The sales price should reflect an over-polished case and a roughly cleaned dial, where the printed areas stand out in a lighter tone. Here is my 2648: