FEUDAL FRANCE. Maine, Herbert I, "the Wake-Dog" (1015-1036), Silver Denier, 1.0g, 20mm, obverse; + CONES CENOMANNIS, monogram, reverse; SIGNVM DEI VIVI, cross with pellets in first two quarters, A & inverted Ω in third & fourth quarters. D'Avant-1553, Roberts-4121, GF
References;
Faustin Poey D’Avant, Monnaies Féodales de France , Graz, 1961.
James N. Roberts, The Silver Coins of Medieval France (476-1610 AD) , South Salem 1996.