Actually closer to sanded rather then polished or natural. If you spay it krinkle black first, then take about an 80 to 100 grit sandpaper in a sanding block, go front to back, sanding off the paint, that's about what is expected to be seen.
Leave the paint on the edge as that's what designates the difference between a 67 and 68 top. The '67 has no paint on the edge. The 68 does.
Let the paint dry a couple of days before you do this otherwise the dust from the sanding will likely stick to the paint in spots. Once it's completely dry and hard you can blow the dust off with compressed air at about 20 psi.