No VAT will be charged on the hammer price, but VAT at 15% will be added to the buyer's premium which is invoiced on a VAT inclusive basis.
Please note the following additional exhibition reference:
Murnau, Schlossmuseum, Maler des "Blauen Reiter", Paul Klee, Deutsche Expressionisten, July - November 2006, no. 18 (illustrated in colour pp. 50-51).