Hi and welcome to the GMB. This looks like the signature of Sean O'Donoghue, who has a studio at Noosaville in Queensland. Born in Ireland and trained at the famous Waterford Crystal, he has lived and worked in Australia for more than 20 years.
See the two example below of his signature.
Please show us some photos of your complete item, both to confirm the identification of the signature and for general information of members.
Trevor