75 Duster silver w/ boca raton-how rare?

In 76 it was coded as A-62....Silver Duster Trim Package


http://www.hamtramck-historical.com...rshipDataBook/1976/76-Valiant-Duster_0019.jpg

In 75 it was basically the same and coded as A-62 Decorator Special Package

http://www.hamtramck-historical.com...rshipDataBook/1975/75-Valiant-Duster_0022.jpg