The painting shows a four-masted sailing ship in Hamburg harbour app. 1901, painted by Prof. Alfred Jensen, private ownership
<a href="//commons.wikimedia.org/wiki/User:Kotofeij_K._Bajun" title="User:Kotofeij K. Bajun">Kotofeij K. Bajun</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>