Portrait of johannes david hahn, born in heidelberg 1729, professor of physics and astronomy, medicine, botany and chemistry at the utrecht university of applied sciences (1753-1775), died in leiden in 1784. Bust on the left, in toga, in oval. Date: between 1 January 1780 and 31 December 1790. Dimensions: height: 256 cm (100.7 in); width: 181 cm (71.2 in). Medium: drawing, watercolour. Collection: Het Utrechts Archief.
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