|Westclox||Baby Ben Style 4||Width of "BABY BEN" on Made by Westclox dial||The very earliest "Made by Westclox" dials have the name "BABY BEN" the same width as "Westclox" below the center. Most have "BABY BEN" wider than "Westclox".|
|Westclox||Baby Ben Style 4||Trip Staff Nut||Long or short nut on trip staff. Early examples have a long nut, and a correspondingly shorter alarm set knob.|
|Westclox||Big Ben Style 1||Repeat Lever||The first Big Ben movement patent shows 2 types of repeat lever. Inventor George Kern changed the repeat lever several times, until the familiar type evolved.|
|Westclox||Baby Ben Style 5||Paint color||Paint color of the style 5 Baby Ben Gun Metal clock.
Early (pre-war): the metallic coat is over the black base coat. Smoother surface.
Late ((post-war): Metallic paint all the way through. Slightly more speckled surface.
Those with back type 4 are unusual - the bezels have the early type paint, and the backs are noticeably more black - very slightly metallic.|
|Westclox||Baby Ben Style 5||Movement Material||Most movements are nickel plated, some during WWII are not.|
|Westclox||Baby Ben Style 6||Movement Material||Nickel plated or brass plates with blue steel bridges.|
|Westclox||Model 66 Movement||Movement Material||Early 66 movement plates are brass, they are steel during WWII, later ones are aluminum|
|Westclox||Model 66 Movement||Movement Date Location||Model 66 movement date location varies by date made and where made (USA, Canada, Scotland).|
|Westclox||Model 66 Movement||Minute Wheel Fastening||Early model 66 movements have no minute wheel fastening, or a c-clip. Later, it was fixed in place by a stud.|
|Westclox||Baby Ben Style 4||Maker's Name on Dial||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."|
|Westclox||Baby Ben Style 4||Lettering at Bottom of Dial||The "A" in "MADE IN U.S.A." has either a dot or a dash after it. Early ones have a dot. This applies only to non-luminous dials with "MADE BY WESTERN CLOCK CO., . . . " at the bottom of the dial.|
|Westclox||Big Ben and Baby Ben Style 7||Lens Shape||Pointed lens until 1960, then rounded.|
|Westclox||Big Ben and Baby Ben Style 4||Hand Type||On luminous style 4 Baby Ben, the earliest examples have simplified skeleton hands, most examples have solid hands.|
|Westclox||Big Ben and Baby Ben Style 7||Hand Type||There are two early types, both used only in 1956:
1) Minute hand has no cap in the center, the sides of the hands are straight (the whole hand tapers from narrow to wide).
2) Second type: Minute hand has decorative cap in the center, the sides of the hands are straight (the whole hand tapers from narrow to wide). The short end of the hand is the widest part of the hand.
The standard type (used starting sometime in 1956 to the end of Style 7 production): Minute hand has cap in center, the hand tapers from narrow to widest at the center, then tapers narrower again. The short end of the hand is narrower than the center.|
|Westclox||Baby Ben Style 1||Hairspring Material||First a blued steel hairspring was used, then a copper color hairspring. The transition was ca. 1920 to 1922.|
|Westclox||Big Ben and Baby Ben Style 7||Hairspring Fastening to Stud||Early examples are pinned, most are glued.|
|Westclox||Model 66 Movement||Gear Material||Most 66 movements have brass gears. Waralarms have steel gears. Late 1950s examples have steel gears.|
|Westclox||Big Ben and Baby Ben Style 7||Dial Numerals||Radial numerals to start, changed to upright in 1958.|
|Westclox||Baby Ben Style 1||Dial||Baby Ben style 1 dials were first celluloid covered, then plain paper. At first, the dials just say "baby Ben" with the first "b" lower case, and the back of the "4" is curved. Later, the back of the "4" was made straight, followed by the first "B" in "Baby" being upper case. The trademark "Westclox" was added to the dial in late 1917. Lettering at the bottom of the dial started in 1915.|
|Westclox||Baby Ben Style 5||Dial||Ivory Style 5 Baby Ben luminous dials were brown-banded at first, and were solid brown starting ca. mid-1948.|