This compendium shows remarkable similarities to Epact 20713 and can probably be attributed to the same maker or workshop.Like the other compendium, this instrument is engraved on the back as a quadrant. The plumb bob is now missing.
The unusual names for Tuesday and Thursday, i.e. Erichdag and Pfinsdag on the table of planetary rulers for the hours of the day suggest a Southern German origin.
The extensive decoration includes figures holding astronomical instruments, and inside the shadow square on the back, a man with a spade and a severed head.