The manufacturer of Amphora Xtra went out of business early this year.They were associated with Bugatti and Porche designs and were the only pipe co. in the Netherlands.Amphora's were not high end pipes but known to be good smokers. The Xtra designation were the high end of Amphora pipes.I have a prince shape on the way myself and hope it smokes well.They are likely equivalent to Grabow or Kaywoodies. Good luck with yours mate! 20-25$ is likely fair for both if in good condition.