Inscription
by later hand, lower right verso in graphite: Johann Rudolph Schellenberg / 1740 Basel Töss b. Winterthur / 1806 / Inv. 524; upper center verso in graphite: 4290
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by later hand, lower right verso in graphite: Johann Rudolph Schellenberg / 1740 Basel Töss b. Winterthur / 1806 / Inv. 524; upper center verso in graphite: 4290