Circa 1910, pilot truck has solid tin wheels, boiler has full rivet details. cast lugs to hold handrails, red smoke stack and this earliest version factory made wooden headlight. 

Circa 1911 same as model above except has non-covered headlight.

Circa 1912 - This version has the earlier headlight, cast holders for handrails, but 1912 couplers.

Circa 1912-13, locomotive now has covered headlight black tin pilot wheels and smokestack, also automatic coupler on front of pilot. Handrails are now held by cotter pins.

Circa 1914-16 Similar to above except pilot wheels are 10 spoke cast iron.

Circa 1915-16 rubber stamped with disc wheels and correct tender.

Circa 1917-1918 - The last version of the 'early' No. 1125. It's identical to the previous version except the plate is missing and it's rubber stamped IVES No. 1125 in the indentation where the plate had been.