As far as I know Stuart never included uranium in any of their glass, so I'm going to disagree with your suggestion Keith.
Sorry, I can't offer any constructive ideas tho - might the orange colour suggest a more modern piece of glass?? - just thinking out loud really.
Meant to add...... can be helpful to describe the extent or otherwise, of wear - not always possible to see in screen pix if there is any or not, and can make a difference to thoughts on age. Assume I'm seeing a ground/polished pontil - which normally would indicate a piece of reasonable quality.