Will is this watch a size 18 or 16? if it is 16, the dial is absolutely authentic. Waltham used painted dials on their 16's. It looks like an original dial to me. I have had 4 of them in size 16 and all exactly like yours. Now the size 18 used a enamel dial and was not painted but Waltham used those painted dials all the way up to the 1940's