I have the original window sticker for my 1966 corvette (along with Protect-O-Plate, owners manual etc). The window sticker lists all the options on the car which check out. However, the option for leather - “2402AH Leather Black Trim” has $ 00 for the price. All other options show the appropriate costs. Is this abnormal?

 

Does the car actually have leather? It could be one of those listed but not purchased options.