Welcome Gerhard,
Typically we need more information but an easy internet search shows this is a cold molded Bounty model of LF Herreshoff (design 58). It is 66' LOA and not quite 58 on deck.
S/V Bounty (Arrluuk), 57'6" ketch
L. Francis Herreshoff Design # 58 Location: Oxford, MD
The boat sails well, is a well regarded yacht, and has had a few dozen replicas built.
Charles