Circa 1903-04 No. 0 Loco has litho cab with "IMC" (Ives Manufacturing Company) under window. Similar to No. 3 from this era except it has black stack and smaller spring.

Enlarged photo for detail.

The two examples above are the earliest variation of the IMC clockwork - note the different roof lithograph, the cast wheels on the tender and the open hole cast lead wheels on the locomotive, while the example below has tin wheels on the tender and front of engine.