Interesting ivory diptych sundial by Leonhard Miller signed and dated 1636.
Face 1A: Wind rose with 8 points 16 directions labeled in German. Sun face motif at center.
Face 1B: Zodiacal symbols, latitude table for European cities.
Face IIA: German lunar volverle with brass disc Initial Maker LM with maker marks.
Face IIB: Sun and moon decoration,Compass with fleur de lys maker mark Cardinal directions.