The blue edges of this are iridescent and the printing amazing - pre-war German Hartwig & Vogel - Unfortuanetly the factory given over to war production so RAF wiped it off the face of the earth... So these tins not seen thereafter - part of a butterfly series all with iridescent elements.
One for rarity...
And finally got to Love a bit of strange design on a french art nouveau cacao sample tin...