The Missouri Pacific Railroad issued the green perpetual calendar with the Sunshine Special illustration in the late 1920's. These calendars were given out free to businesses to promote the railroad's freight and passenger service. You are buying only the replacement cards and not the metal calendar.
The Missouri Pacific Historical Society saw a need to reproduce the months and date cardboard cards as many pf the original sets were worn out, lost or replaced with the silver sets. If you have a good set of cards you can now put them away and use these on a daily basis.
When we reproduced this set we scanned an original set that was unused. We also had three of the original metal green calendars that had three different green colors due to aging over the years. one was a very dark green, another a medium green and a third that was a light apple green. Our decision was to match the original cards as closely and disregard the colors of the metal calendars. As you can see in the photo the new cards look great on the old calendar.