I have a few questions regarding the Imperial tenor. I've been looking at one serial # 311xxx. I believe this was built in '67 and Wurlitzer bought Martin in '64 so my question to you all is this. Are these bad horns? I hear they are student/intermediate horns. When Wurlitzer bought Martin, did Wurlitzer start making them or did Martin keep making them? They where still manufactured in the US, correct? Thanks all for answering any of these question!