Viennese 30 Day calendar movement by Johann Worle, Wien, now in a later purpose made Laterndluhr case of uncommon 9-light keystone design, rich mahogany veneer with holly banding or edging. movement driven by two weights supported by a single wheel pulley with saddle, with maintaining power and early tapered pillars. And with old crank. C.1830.

Johan Wörle 30-day Dachluhr calendar Vienna, ca. 1830.