Portrait of a Man (Ralf Blundill?)

Inscribed at lower center in pen and brown ink: From a picture done many years ago; beneath this in a different hand in graphite: of; and in a different hand in pen and brown ink: Ralf Blundill / at Greenwich 17 Aug. 1741.; on verso at lower center in pen and black ink: From a picture done many years before; beneath this at lower left in a different hand in pen and brown ink: Nir705 and at lower right: 2..6[?]; on album sheet beyond upper right corner of drawing in graphite: 67. Collector's mark of Jonathan Richardson Sr. stamped at center right.