Houghton Monogram 455.8 (nmo:Monogram)
- URI
- http://numismatics.org/sco/symbol/monogram.houghton.455_8
- Monogram 455.8 from Houghton, Lorber, and Hoover, Seleucid coins : a comprehensive catalogue (2008). The monogram contains Π, Υ, Μ, and Ο as identified by Peter van Alfen. (en)
- http://numismatics.org/sco/symbol/monogram.houghton.455
- Π, Υ, Μ, and Ο
- http://nomisma.org/id/greek_numismatics
- http://nomisma.org/id/seleucid_coins
