Postumus - Providentia interesting! (D2050)

This is a so called barbarous imitation minted by germanic or gallic tribes. Very fine style! 

Silver antoninianus, RIC V cf. 323 ,Very fine,
Cologne mint, 3,15  g, 22 mm, 
obverse IMP C POSTVMVS P F AVG, 
radiate draped and cuirassed bust right; 
reverse PROVIDENTIA AVG, Providentia standing left 
holding globe and transverse scepter;