The Charles Daly Over/Unders are a boxlock action with 26", 28" and 30" barrels with ventilated ribs. Various choke combinations were offered with single selective triggers and automatic ejectors. Blued with checkered walnut stocks. The differences between the grades are the degree and quality of the engraving and the grade of walnut used for the stock. The smaller-bore weapons bring a premium. mfgrd between 1963 and 1976 by B.C.Miroku. The grades appear to be Venture Grade, Venture Grade Skeet or Trap, Field Grade, Superior Grade, Superior Grade Trap, Diamond Grade and Diamond Grade Trap or Skeet.
As to pricing, I can't help much there as my references are somewhat dated.
