You only mention a "52 tooth sprocket", as in single, w/no mention of road components - is it a track bike? How much did it originally sell for?

For a reference point, I have a circa-1980 Team Champion, Columbus frame w/long-point lugs, chromed crown, light blue metallic w/silver decals, w/mix of SR & NR. The LBS where I purchased it had it stickered at $1,600 (this was in 1981). I've been advised to use 50% of original price as starting point on vintage Campy bikes, so YMMV.

I have found next to nothing info-wise on these as well.