Having just spotted Keith's vase
within a thread in the Murano forum, I searched for his original message and would like to add this to the query ...
Green satined vase, 25.7 cm (9 3/4 inch) height. Base of foot is not satined and has a large indented central area with remnants of a circular cracking off mark (no photo of this as yet - needs daylight to show the details and it's now 3am where I am). Also, the underside of the turned over rim is not satined, and neither is the interior of the neck nor the initial part of the slope to the turn of the rim.
Does it glow under uv? See the photo. Same reaction under both longwave and shortwave uv.
When I bought it in the early 1990s, the dealer had it marked up as "Richardson Apple Green". I have no idea whether Richardson would be a correct attribution or not. And until now I have not seen another like it.