I'm aware of the Gottlieb webbing, but did they also do a splatter? Perhaps on earlier games? Any pics of such splatter and any idea of years/games?

re: webbing vs. splatter, here's what Clay says re: which games got which technique:

Did my Early 1960s Gottlieb Cabinet use Black Webbing or Silver Splatter?
Most Gottlieb EM metal rail games from 1960 to 1978 use a black webbing paint over the base cabinet color. There are some exceptions though, most notabily games from about 1960 to 1963, which sometimes use silver splatter instead of black webbing. However anything 1963 or later should have black webbing. If not sure about the game in question, check for original paint on the inside of the sides of the cabinet (above where the playfield is mounted and below the metal side rails), or under the legs, or any other area that did not get much wear. Gottlieb used more than one company to make cabinets, and these different companies did not get the webbing/splatter designs consistent until about 1963.