This is a Ben Zuckerman coat, in a heavy black wool.  It is double breasted and fastens with black satin rosette buttons. The coat is decorated with a black satin collar.
The coat was sold at John Doyle Bishop, Seattle. John Doyle Bishop was an Irishman who lived in Seattle, and owned a luxury boutique from the late 1940's to the 1970's.  Mr Bishop was a well know local character, who was famously arrested on St Patrick's Day, 1972 after painting a green stripe down Fifth Avenue in Seattle.
Photos courtesy of Alaska Books, Gift and Thrift.