Item one: cf. exhibition catalogue, Die Römer zwischen Alpen und Nordmeer, Mainz, 2000, pp. 427-428, no. 228a, for similar dated 2nd Century A.D.
Item twelve: cf. R. Hattatt, Iron Age and Roman Brooches, Oxford, 1985, pp. 130-131, no. 501, fig. 55 for similar unusual fibula, with reference to two found near Basle, Switzerland, dating to first half of 3rd Century A.D.