The Keno alarm clock was introduced in 1930 in a round case with legs. It was a non-descript clock without the Westclox name. Two round case styles with base were made from 1932 - 1941. After World War II, a Keno with wire bail base was made. Finally, two plastic cased styles were made.
When identifying a Keno style, observe the case shape and ignore the case and dial color, as the styles were made in various case and dial colors, as shown in the detail page for each style.
The Keno alarm was introduced in July 1930 as a non-descript clock without the Westclox name on the dial or back of the clock. At least green and possibly blue were available in the Style 1 case. This case was later used for the Style 1 Bantam with peg legs, introduced in April 1931.
The Keno model case changed along with the Bantam case in August 1932 to the Style 2 case having a stamped steel base in either green or blue. The style 2 case was made until January 1935 when a new black case (Style 3) was introduced. The style 3 Keno case would later be used for the Bingo model (but Bingo has a different base) and had vertical stripes in the center of the dial until 1938 when the stripes were changed to horizontal. In November 1938 a tan color was added with "United Time Products" on the dial. Both the plain and luminous dials of the tan case were banded. The Keno model was sold out in 1940 and no orders were being accepted.
After World War II, the Style 4 with the Keno name on the dial and in the Bell Boy case (wire bail base) was available, likely as a non-descript clock.
A plastic cased model, Style 5 with "Made by Westclox" U.S.A." was made in the 1970s, although this model was not listed in any Westclox catalogs of the period. Another plastic version was available around 2012.