Designed by Fred R McConigal and built by the Lark Aircraft Co in 1927 it is possibly a redesignation of Commercial Sunbeam.
The one built, NX137E c/n 1, had a four place cabin and two place open cockpit. Power was a 225hp Wright J-5.
It became known as a United Lark after the take over by United Aircraft Corp.
All Aero 