Here's some additional pics:

Addressee to War Veteran Captain Percy Willis

Built in 1909 for Matson Navigation Company as SS Wilhelmina, she sailed from the West Coast of the United States to Hawaii until 1917. After her war service, she was returned to Matson and resumed Pacific Ocean service. In the late 1930s she was laid up in San Francisco, California, until sold to a British shipping company in 1940. While a part of a convoy sailing from Halifax, Nova Scotia, to Liverpool, she was sunk by U-94 on 2 December 1940.

"Here is the boat that brings most of my mail."

Here's a pic of a woman actually aboard the SS Wilhelmina in 1928.

