Type: Mark
Location: Underside
Inscription: "RTENBY" stamped in rectangle on the underside, partially effaced at left.
Type: Mark
Location: Underside
Inscription: "WHAR NBY" stamped in rectangle on the underside, partially effaced at center.
Type: Inscription
Location: Underside
Inscription: "M6509 / 55865 / 51996" scratched.