The style 4 Baby Ben case is a modification of the style 3. There is no matting ring between the dial and the glass, and the base has two convex curves (one on each side) instead of four concave curves. The glass is convex.
Baby Ben style 4 was introduced in 1934 and came in two case colors. The ivory case with brass trim has a white non-luminous dial with black figures, or a brown-banded luminous dial. The black (actually called gunmetal, a grayish metallic paint) case with nickel trim has a white non-luminous dial with black figures, or a solid black luminous dial. The alarm winding key is lower on the back than on style 3, and there is a sliding cover on the regulator slot (also used on styles 5 – 8).
In late 1936, the company name was changed from “Western Clock Company” to “Westclox Division of General Time Instruments Corporation.” In late 1936 or early 1937, the lettering at the bottom of the dial changed from "MADE BY WESTERN CLOCK CO. LA SALLE, ILL. U.S.A” to "MADE BY WESTCLOX, LA SALLE, ILL., U.S.A.” Style 4 Baby Ben was discontinued in 1939.
Differentiating Style 4 Dials from Style 5 Dials
Style 4 Dial:
Has curved tails on the numerals 6 and 9;
The word "WESTCLOX" is narrower than "BABY BEN"
Style 5 Dial:
Straight tails on the numerals 6 and 9;
The word "WESTCLOX" is approximately the same width as "BABY BEN'.