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A very sought-after Campagnolo C-record NOS pulley pair. Cool ball bearing design. Folks often hot-rod other derailleurs with these. Very important - these have been sitting on a shelf for over 30 years so the grease in them is totally dry. To make these work, we remove the covers and drip in tri-flow. The if not running free, use a 13mm wrench on the flats of the cone and that should get things moving. If you're motivated, you can take them apart and do a formal soaking and re-grease.
We know that folks like to use these on all sorts of derailleurs. But be aware there is a little bumpy protrusion that is designed to nest into a C-record cage plate to hold one cone in place while you adjust the other. You'll need to flatten this bump if you put the pulley's into a Campy NR/SR as they don't have a spot for the bump to nest into (only one coverplate on each pulley has it). We suppose you could file a little indent into your derailleur's cage plate, but we get itchy at the idea of modifying parts. Also note that the C-record pulleys are about 1mm narrower than NR/SR pulleys. So the cage plate bolts will protrude a bit. You'll need to make sure the bolt's end is clearing the spokes ok. This is more of an issue with smaller size max rear freewheel cogs.