Never cataloged during the 1920s, the little number 0 was always the head of their lowest priced set. The one above has a 1921 date on the mechanism.

Not cataloged during these years, this No. 0 came with a motor stamped 1923.

Circa 1923-24. Although only cataloged a few years the inexpensive No. 0 was probably sold every year. This particular locomotive came from a "Pony Express Set". The example below is dated 1925 on the clockwork. The later small locomotives came with No. 11 tenders from the same period.

Dated 1926

The mechanism on this example is dated 1928.