First name is 西陣 (Nishijin) which is the brand/sales company and second name is
Sophia which is the manufacturer.
I agree that it looks like a theme adopted from the U.S. But slot machines often have Asian themes so maybe it shouldn't be surprising Japan would adopt Western themes. Especially in those days when they were importing U.S. entertainment in bulk. It will be interesting to find out more about the logo though. Is it really a viking ship?