Using pre-made clock parts, and a mold or form, kit clocks were a way for the crafter or ceramicist to make a clock at home. 

Shown below is an advertisement from the April 1959 Issue of Ceramic Monthly, which includes a reference to Lanshire Clock & Instruments Corporation being one of its suppliers.

Please also note the “Mold of the Month” clock kit with Garland Ceramic Original Molds, where ceramicists would receive a mold and clock equipment in order to make a ceramic clock at home.

A 1959 advertisement in Ceramics Monthly by Rovin Ceramics of Dearborn, MI.

Holland was another company that made clock molds. This advertisement is found on page 29 of the same 1959 issue of Ceramics Monthly.