It is possible that these letters are not from a font at all, but hand drawn. This is not a particularly difficult letter style to execute. It appears hand lettered to me. The edge of a clear coat is clearly visible in the photo. And the center of the nine is slightly imperfect.
The placement and size of the turns are interesting. I tended to always center the pattern in the middle of a stroke, which they are not in the picture. And unless these letters are smaller than I think they are, the turns are quite large. The letters look to be in 3 to 4 inches tall. So the spins were either made with fairly huge cotton balls or a larger size of one of those velvet spinning tools they used to sell.
Back in the late 70s, I worked for a while for a shop that was located next door to a company that built custom fire equipment. We rarely lettered two vehicles that were alike. If I remember correctly, a full box of gold was around 250 dollars at that time. It's a little more than that now!
Brad in Kansas City