Circa 1923-1925 clockwork No. 1, this has the same casting as a No. 0 except it came with a break.

This one has a 1923 date on the motor, although the single window No. 1 doesn't show in the catalog until 1926

The one above was marked 1926 on it's motor plate and came in an original boxed set that would appear to also be from 1926.