i have 4 collectable state plates wondering if anyone has any idea is they are worth anything

alabama 1972 first confederate white house montgomery back says first edition made exclusively for chateau inc in denmark by kesa plate 543

illinois 1973 grant home galena back says second edition made exclusively for chateau inc in denmark by kesa plate 428

iowa 1977 famous lawman wyatt earp boyhood home pella-1851 back says sisth issue royal blue chateau made by tidemark co. winterpark fla plate 51

iowa 1978 the historic general dodge house council bluffs back says seventh issue royal blue chateau made by tidemark co.winterpark fla plate 24

if anyone knows anything about these it would be very helpful. thank you