I started a thread on this some time ago. The unanimous response was that the Alpine did not come with a six bladed fan. I still want to believe that my six bladed fan on my very late Series V was stock and just did not make it into the parts lists and books - especially since the color of the fan matched the pulley and the block which was a satin black, with a very slight blue/green tint to it - which was probably from years of oil and antifreeze leaks and fumes.
Jay