1. See Didor 16, 8, 5–7; Herodot 7, 112.9, 75; Euripides, Rhesos, 921–922; Xenophon, Hellenika 5, 2, 17; Strabo 7, 33.34.36; Plinius, Natural History 7, 197 and G. Le Rider in ‘The Coinage of Philip and the Pangaion Mines’ (in: M.B.Hatzopoulos, L.D.Loukopoulos (Eds) ‘Philip of Macedon’, Athens 1980, pp. 48–49 and for detailed discussion D.Keller in ‘Gedanken zur Datierung und Verwendung der Statere Philipps II und ihrer Keltischen Imitationen, Schweizerische Numismatische Rundschau’, 1996,75, 101–120.
2. Results of ten unpublished ED-XRF analysis of Philippou-staters in private collections Geochemical Laboratory MPI, Basel University); the fineness comes close to Au 990 with the additional Cu and Ag contents adding up to ca 1 wt%, which means refined gold has been struck.
3. For detailed discussion of this particular problem see G. Le Rider, ‘Le Monnayage d’Argent et d’Or de Philippe II Frappé en Macedoine de 359 à 294’, Paris 1977 and M.Price, ‘The Coinage in the Name of Alexander the Great and Philip Arrhidaeus’, A British Museum Catalogue (The Swiss Numismatic Society in association with the British Museum Press), Zürich/London 1991 (2 volumes, 637pp, 159 plates).
4. For archaeological dating of Celtic coins found in burials see H. Polenz, ‘Münzen in Latènezeitlichen Gräbern Mitteleuropas aus der Zeit Zwischen 300 und 50 v.Chr. Bayerische Vorgeschichtsblätter’ 1982,47, 27–222.
5. D.F. Allen, ‘The Philippus in Switzerland and the Rhineland, Schweizerische Numismatische Rundschau’, 1974,53, 42–74; H.Polenz -op cit(4) ‘Münzen in Latènezeitlichen Gräbern Mitteleuropas aus der Zeit Zwischen 300 und 50 v.Chr. Bayerische Vorgeschichtsblätter’ 1982,47, 27–222. One Philippou type called the ‘Quarter Stater of Horgen-Unterentfelden’ is very common in Switzerland (see K. Castelin, ‘Keltische Münzen. Katalog der Sammlung des Schweizerischen Landesmuseums Zürich, Stäfa’,1978, coins No 878 to 903 and 921 to 933) and is well dated to the first part of the second century BC.