This varies enormously over time. 1st and 2nd century denarii are primarily right facing with left facing busts being much scarcer. For Probus for example it changes from bust type to bust type. Radiate cuirassed busts are primarily right facing with left facing bust being less common but the degree of how less common varies from mint to mint whilst for imperial mantled busts they are usually left facing for Probus with the right facing busts being rare in comparison. The question is interesting but the answer is complicated. Martin
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