"After further review", I am going to amend my previous conclusion that the chrome buckles were the Deluxe Option. Charles' statement in regard to the Pace Cars prompted me to do some further digging. When I initially read the 64-1/2 Sales Brochure, and it stated that the "Standard Belts" were black, I took that to mean that both the belts and buckles were black, much like Standard Belts in Black would be for 1966 and 67. However, after blowing up the pictures in the 64-1/2 brochure, and looking at the 1963,64 and 65 Accessory Catalogs, the 1965 brochure, the 1965 Facts Book, the 1964 and 65 Parts and Accessories Catalog, and the 1960-68 Master Parts Catalog, I have come to the conclusion that my supposition was incorrect. I believe that the statement in the 1964-1/2 brochure only meant that the belts were black, not the buckles on the "Standard Belts". On the Deluxe Belts, both the belts and the buckles were color keyed to the interior color.
To help support this, I have attached a couple pictures from the 64-1/2 brochure, and pictures from the 1964 Accessory Catalog and from the 65 Car Facts Book. the first picture shows 64-1/2 Standard belts ; the second shows 64=1/2 Deluxe Belts, the third shows the color keyed belts and buckles, and the last picture shows a 1965 Standard Belt, just for information.
Sorry if I mislead anyone. I'll go back and modify my previous Post noting that the Deluxe belts had chrome buckles.
Bob
Bob