From what I can see the shape of wing nut on Bob Perkinks car looks correct. It doesn't look like the wing nut on some Mustangs that I've judged. I do have some wing nuts that the color is slightly off but not shiny zinc or shaped like the one on the 1968 Mustang wheel shown. The 1968 Mustang wing nut looks like what being sold by parts vendors now. I purchased one earlier to see the difference.
Richard: consider that the parts you're looking at are as much as 50 years old now. Zinc plating will dull and break down over time depending on conditions. I found a couple original wing nuts and they were dull silver, almost gray on the top, but flipped over, were silvery zinc plating on the bottom. Skin oils from fingers taking the spare out can add to the breakdown of the finish.
Also, if you notice the trunk of B. Perkin's 50 mile '66, the trunk latch striker is bright zinc plating. You've been deducting points for "too shiny" plating on concours cars, which I believe is too harsh. Someone has taken the time to replicate the original finish by actually getting original parts re-plated and being dinged for it. I'd rather see a part in the correct finish, even if it's off just a tad off instead of cast blast or 'faux' paint used, or even worse, blasted or wire wheeled with clear coat applied.