The following breakdown covers just the frames for the early 50 series passenger cars produced by IVES prior to 1910. There is obviously some overlapping of the types and this list does not take into account some of the frames found on the 54 gravel car also made during this period. Rod Cornel and myself have been observing these cars from original sets for years and believe the following listing is fairly close.

Type 1  - 1901-1903 - painted embossed springs.
Type 2  - 1902-1904 - flat either painted or lithographed.
Type 3  - 1903-1905 - white springs, cross-hatching outlined, red black and gold steps
Type 4  - 1904-1905 - red springs, cross-hatch without outline, white-stripped steps
Type 5  -1905-1906 - red springs, no cross-hatch ... red-striped  steps
Type 6  - 1906-1908 - red springs, no cross-hatch ... white-striped steps
Type 7  - 1909 - plain frame

Type 1 - early hand painted cars - frame is embossed with spring detail - no lithography.

Type 2 - frame is flat with no embossing, no truss rods  and either painted (above) or lithographed (below) with spring detail.

Type 3  - White springs, cross-hatching outlined, red /black /gold steps

Type 4  -  red springs, cross-hatch without outline, white-stripped steps

Type 5  - red springs, no cross-hatch ... red-striped  steps

Type 6  -  red springs, no cross-hatch ... white-striped steps

Type 7  -  plain frame