A comprehensive history of Grace/Prudential/Delta here https://www.theshipslist.com/ships/lines/grace.shtml
The photo would appear to show her in Prudential ownership.
As built they were designed for - amongst other things - the west coast banana trade. An interesting design.
Scroll down almost to the bottom to get info on the design of the 'M's and the trades they were in.

One of Delta Lines' famous "M-Ships", which were very popular passenger/cargo ships for many years on the run from the U.S. to the West Coast of South America.