O.K. , Here we go....... from my information;
Mills Chrome Bell (Diamond front), 1939 - 1944.
Originally came out in 1939 ,Chromed castings, diamonds chromed also ,then red painted, with cabinet wood sides painted Silver.
Few sold with Side vendors.
1941 Introduced Gold Glitter = "Gold Chrome".
a bit later also 1941, Introduction Emerald Chrome with option of a hand load Jack pot.
December 1941 , Introduction of the Copper Chrome.
The U.S. into W.W.2 , So 1942- 1944 a small number of these machines built on the sly ; since "Critical war materials". Chrome was already on that list shortly after Mills introduced this line, Hence the painted versions.
jeff H.