I can't see anything of note other than they are standard track cranks in 170mm length, which for the type is a bit scarcer than the common 165. You can see plenty of vintage campy track arms/ track gruppos at Hellyer ( and I suppose any other) velodrome, as well as many vintage Cinelli track bikes ( more on that later). If I may be permitted a bit of snarkiness, another example of eb-offing by a seller who doesn't know what he has, only somewhere he got the info that crampangoslo stuff is valuable. didn't even list the crank arm size. ( another great examle of the flea market mentality it the weyless seat post missing the vital clamp and the seller doesn't seem to understand that concept.)
Ricardo Bulissimo, Verdi, Nevada