In this website you will find the following type of emblems:
Enameled

fiatstd.jpg (12765 byte)

This type of emblem, sometimes called cloisonné, has a metal base of copper,  which is usually plated with chrome, nickel, or gold and is inlaid with enamel colors.  By enamel, we mean the hard fired porcelain or glass (it is really a true glass and not porcelain). This kind of emblem was used on almost all cars until the 1940's.  They can be found on the radiator grille, headlight bars, hubcaps, trunk racks, spares, side mounts, and in the interior as well.
Nameplates, scripts and lettering on either plastic or metal

ferrariscript.jpg (18244 byte)

painted metal
Such as thin brass stampings from the pre-war period, with paint in the recessed areas.  This kind of emblem is usually thin and easily bent and is usually wrapped over a heavy gage base.  Another example would be the chrome plated die cast or stainless steel stamping made in the post-war period with paint again in the recessed or top areas.  When these emblem deteriorate, the paint gradually wears thin and disappears.

hood mascots of solid metal, glass, or color dyed plastic
hood ornaments, usually made of chrome plated die-cast pot metal. In the post war era, transparent amber, red, etc. colored heads or wings.

decals
graphic designs, logos or lettering using a transfer method for use over painted surfaces.