OBSOLETE - None are Available - Drive Motor used in 940, 960, 963 timer assemblies.
Voltage rating 8.5 to 13 VAC, 60 Hz, 2/3 rpm ( Sometimes labelled .66 rpm ).
12V AC, 60 Hz 2/3 RPM CCW 3W Timer Motor. Part No. 1000891
If you have the Autotrol 255, then the best option would be the Logix 740 Upgrade Kit, or a complete new Autotrol Valve, since other parts for the 940 and 960 are no longer available.
See Replacement Options