HART, Pro (1928-2006) (2) 'Happy Birthday Horse,' (21x30cm); & '... the Planes are a Bit Small,' (21x28cm). Pencil & Ink (2). Also, 'Rhiannon - Why Can't You Just Play Darts Like Everybody Else,' 1981, signed indistinctly lower right (artist not identified) (21x28cm). Estimate $200-400