The Lionel Track Clip No. CO-1 was of all sheet metal construction and was designed to hold two sections of O Gauge track securely together.
Although only available in 1949 during the Post War Period, these clips were sold during the Pre-War years from dealer boxes of 50 or 100 each. According to the 1950 catalog, production was discontinued due to a material shortage that may have been caused by the Korean War. It was not until the advent of the Modern Era, 20 years later, that these clips would again be available. There are no variations.
During the time that they were in production there were two distinctly different boxes:
The first type showed a varying number of clips that were written on the side of the box depending on the number of tracks that were included in the set of which these clips were a component. During the Pre-War years, and in 1945-46 during the early post war period, these boxes contained a tube of lubricant and a UTC Lockon. This type of box was included in sets. One of these boxes is shown below to the left.
The other style of box that was available only 1949 contained one dozen of these clips, and this box is illustrated below and to the right.