Several libraries have the sheet music, described thus:

CAPTAIN MAC'
Words by P.J. O'Reilly; music by Wilfred Sanderson.
New York: Boosey & Co., ©1915

FIRST LINE: Oh, well set up and handsome as a sailor man could be,

FIRST LINE OF CHORUS: Oh, East and West, North and South, 'Frisco to Perim


[I could not find a library where the sheet music was viewable online.]