Thanks Anne for the help.
Luckily we have just found some paperwork that goes with the vase, which tells us a lot more about it.
One piece of paperwork states ...
"This piece of Stuart Crystal has been engraved by Michal Fairbairn to illustrate the Galapagos Penguin a species in danger of extinction. Only three engravings of this species will be made - each unique in design."
It is signed by Michael Fairbairn A.R.C.A and W.C. Stuart Stuart and Sons Director.
The other paperwork is a letter from Harrods and a letter from Red House Glass Work, Stourbridge.
The Harrods letter, dated 12th June 1973, explains that a small number 15 etched next to the penguin is the serial number of the Penguin vase.
The Red House letter, dated 15th June 1973, explains that this vase is part of series based on wild life animals, created by Michael Fairbairn.
We will now look for a reputable appraiser to see what the value of the vase might be.
Many thanks
Pete