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If your coin flip from obverse to reverse for the photos is correct, then I think it would be about 80 degrees.
Think about it, 360 would be a rotation completely around. Your starting point would also be your finish point. Think of the face of a clock. If you start at 6, a move to 9 would be 90 degrees, 12 would be 180 degrees, then continue all the way around back to 6, would make 360 degrees. Hope this makes sense.
A good way to do this is using a mirror. That way you can look at, photograph, your coin at an angle and capture both sides in one photo.
I think I got this correct!
Use the search box, Home page top left. Type in coin rotation and read the results.
Good luck!