The bezels on gold capped Constellations were generally solid 14k gold.
The case on the watch you are considering is heavily polished - and these references are not the most popular of Constellations - so only buy if it is very cheap
Yea that looks like a very rough case, its a shame because they are an uncommon but quite cool reference, but their angular case design seems to make them a magnet for abuse and bad polishing jobs.