No markings what-so-ever, openings are 1 1/8" x 13/16".
(http://farm8.staticflickr.com/7308/27452147464_e9cc625a0b_b.jpg)
(http://farm8.staticflickr.com/7307/27452117524_498c82385d_b.jpg)
(http://farm8.staticflickr.com/7464/28031893866_a266ca465c_b.jpg)
Spark Plug wrench??
Possibly a lathe, or, tool post wrench?
Saw one of these on a facebook group and the person has Packard Hubcap Wrench on it, so I searched google and see 2 of these at the top but there are several different wrenches. Not sure what to believe.
https://www.google.com/search?q=packard+hubcap+wrench&sa=N&biw=1067&bih=537&tbm=isch&tbo=u&source=univ&ved=0ahUKEwjzu8zShtzNAhWBdyYKHfKdA8Q4ChCwBAgx