Mmmmm...... Still unable to find ?I'm not positive, but I think that Stuart is a secondary line by Barontini.
Google Pipedia, on that site choose Italy as the country, and then pipes beginning with letter S. You should find it there. Maybe someone more proficient with computers can give you the link. Also try pipephil.eu which has listings of almost all pipes and their logo.
Thank you guys ?. Able to find about it. Not much info, but at least I know it's Barontini 2nd brand, and from Italy. But there's really no a single picture of this pipe in internet ?I believe Agnosticpipe has it. Stuart is a Barontini second. I also have an old one.