SMC SMCD3GN4

"D3GNV4", "Rev:1.2", a circled A, and what appears to be a typical
 * Askey label appears to be on the board in the FCC photos.
 * Askey is presumed to be the manufacturer..

Per a later FCC Class II Permissive Change, some models
 * / submodels have the 5GHz band disabled via SW..