As others have already written it is a vertical sundial, facing South, with polar style, with its center in the point A of the attached figure.
Since the style continues beyond the disk, the part BC of it can work as a polar style of a sundial facing North, with center in B, drawn on the hidden face of the disk. Even if the style BC is very short, being the northern face illuminated only in the extreme hours of the day, the shadows would be long enough to reach the edge of the disk. The northern side of the disk has been being illuminated from 5:30 to 8:00 (around) and from 16:00 to 18:30 The lines of the hours on the northern face would be those drawn on the southern face for the same hours (see the Roger Bailey’s drawing) Does someone know if the hours are written also on the northern face of this sundial ? Best Regards Gianni Ferrari
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