Color changing depending on the light source and background. Fairly certain the 365nm UV glow is from manganese vs uranium glass - though quite bright. The taller vase is signed C Wright on the edge of the base along with the year, 1976. The shorter vase is signed in two places but differently - first on the base near the snapped pontil WAS'77.
It appears he also started to sign it on the edge of the base as well, but it's so tiny I actually almost mistook it for a small scratch. Both are in pristine condition. Experienced international art glass shipper. Will be well packed and insured.