Facing Sol, CONSERVAT AVG on Ticinum reverses of Probus.
For the sake of convenience, this coin is typically catalogued as a RIC 350 variant. Sol, instead of looking left, is facing and nimbate. Probably deserves its own listing, and will likely have it, in the revised RIC. The old one often didn't pay attention to such details. In older numismatic literature, only Andreas Alföldi did, but his study was limited to coins of Siscia only.
We also encounter the nimbate facing Sol on variants of RIC 351, and RIC 352.
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RIC 350v

Image: Courtesy of S. Luethi.
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RIC 352v.

Image: Courtesy of Barnaba Skibniewski.
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The typical Sol, looking left, RIC 350:

Image courtesy of: Paul-Francis Jacquier 46-361, Ex P. Gysen.