1973 Super Duty 455 Formula, 1 of 43 SD Formulas for '73 and 1 of only 9 in Ascot Silver, Automatic. The car is featured in two restoration books and on the cover of Joe Moore's Restoration Guide Book (see pictures). The 1973 SD Formula is the most expensive non Trans Am Firebird model ever made and #1 cars are valued at $150,000 by Hagerty and other price guides. This car is registered on the super duty registry and won its class at POCI several times. A great example of an original piece of Pontiac history! Awards, history, signs, and memorabilia associated with this car are included in sale price. Serious inquires only call 417-766-4660, thank you.