An interesting jug I missed from a German auction site, possibly 15 December 2006.

It sold for 60 Euros.

Mettlach-Kakaokanne. Steingut, grüner Hermes-Stempel, Dekor 8202.Kugelig gebaucht, Deckel mit Kugelknauf und anmodelliertem Sieb.Auf cremeweißer Glasur blau-weinrotes Karo-Dekor mit schwarzenKreuzungspunkten. H 21 cm. ABB.B 126

It seems that the character on Villeroy & Boch's stamp is Hermes. I didn't realise that: he wears a winged cap and carries a caduceus.