Well I took up the suggestion of emailing Nazeing glass works and today received this reply!
I can confirm that the glass vase was made by us for the Royal Academy of Arts, using a design by Ivor Abrahams RA, on e of 4 RA artists we wroked with
in the 1990's.
I was in charge of Sales then, and negotiated the contract and met Ivor. I even have a signed copy of his book of this period.
His dancing figures were bold and strong, and he did some sketches that we sand blast engraved on the vases.
As to value now, I have no idea. I can try and dig out the RA file from our archives and see what they were selling for then, about £39-£45 each, I should think,
and we engraved 25-50 I guess, so there are not too many around.
I would offer £25 plus postage costs for our Museum,but you could try to offer it at £37.50 and see if someone wants it at that price.
I hope this helps.
How exciting is that? We will send pic. of it to our friendly auction house and see what they think of the value and the best way to sell it. Any thoughts from members will be useful.