The crank is a Campagnolo Super/Nuovo Record. The crankarms were the same for NR/SR with SR having different rings. The outer Eddy Merckx pantographed ring looks to be a Super Record Ring. The ring could possibly worth more than the crank arms themselves. Pantographed items tend to go for a decent price on Ebay and that outer ring alone could be worth $50+. The cranks and rings are worth $100+ alone. You asked about the group, but it is only a single picture. Campy cranks, Shimano 600 front derailleur and some low end pedals doesn't tell us much.