American Genealogical-Biographical Index (AGBI)
Name: Robert Develon
Birth Date: 1740
Birthplace: Virginia
Volume: 43
Page Number: 113
Reference: Historical reg. Of Virginians in the Rev., soldiers, saliors and marines, 1775-1783. Ed. By John H. Gwathmey. Richmond, Va. 1938. (13, 872p.):221

Don't know what your numbers are but they could be in reference to a land grant or pension for services rendered.