Whitman's choclates and confections porcelain sign

This sign was at a antique shop priced for $125. Thankfully, the guy who owned the sign was there. I told him it was in bad shape, and would buy it for $30. The said he would go down to $75, but I still wanted it for less. It told him $45, he said $50, so I bought it for $50. I have seen this sign someplaces, and think it is from the 1930's. I really need help pricing this sign. as you can see, there is big damage on the bottom, chips someplaces, and the back was repainted a grayish color. Can anybody help? I can't find anything on it.