I thought so too.
I am not an Omega expert, but a few details strike me as atypical for chronograph dials from this period. Firstly, the surface finishing. The silver-metallic appearance of the section where the hour markers are is not typical of two-tone dials. Secondly, the lack of space between the seconds/minutes scale and the telemeter scale is unusual. Thirdly, the width of the railroad tracks in the sub-dials looks too wide, I believe.
I would be curious to know what led you to conclude that the dial is original? Do you have photos of a similar, original dial for comparison?
Source of photo on the right:
https://watchesbysjx.com/2021/09/omega-speedmaster-chronoscope.html
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