The Air Britain publication ‘The British Civil Registers 1919-1928’, Peter Moss 1969 adds little, but does record that:

G-EBCB Avro 504K, formerly H221, no constructor’s number. Issued with a C of A 2nd May 1922 with Kingwill & Jones Flying Co. Withdrawn prior to C of A expiry on 24th April 1929, as marks were cancelled February 1929.

The same publication also rules out G-EACB as the full registration of the aircraft in the OP, a conclusion already arrived at by others.

G-EACB Avro 504K, formerly E1671, no construction number. Registered 9th May 1919 to A.V.Roe & Co. No C of A issued. Marks cancelled in September 1920.