Keys in a clockSolfege signs on the white keysThe dozenal numbers in the notes denote the keys and correspond to numbers in a clock.
The Solfege signs on top denote the major (red) and minor (blue) triads.
Part of Circle of fifths and solfege signs (image set)
Own work
WatchduckYou can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".