Hi cruzer, and welcome. Not all Petri cameras had built-in meters, especially the oldest ones. My Petriflex V had no meter but my Half-7 did, and so did my Dad's 7S. So there may be no way to set film speed, and no reason to, depending on your specific model.
Some Petri cameras had a red C.C. preceding the Petri name on the front lens ring, and I believe that stood for "Color Corrected". That's not the camera model, but does give a clue to the vintage.
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