That is the only marking I have with the "B" so I am not sure a "Black wall" was even specified. With that said I have none with a F70 R or 70 R so I doubt it is a badly written R. I only have 54 markings tied to VINs and most are repeatable. Below is the only paperwork I have on the "B" marking in the picture above. Following up on Dan's response, you have to wonder what "Special Package" is?

Perhaps others will chime in.

D