Powell Flute questions

[FluteDude]

I Just Joined the Party:) Anyway, I have a couple of Powell flute questions...I've searched all over the net for answers but, have not been able to find the answers! I didn't Call Powell to ask, maybe I Should have...anyway, here are my questions: 1) How much $ would a Powell Handmade, Custom, Silver (Normal +/-) flute...manufactured in 1971, have cost at the time of manufacture...ball park? 2) Can anyone tell me anything about a Powell PM-11? IS THIS the model? What level would this be considered? Years of Manufacture
Anything about the line...characteristics, etc. Any info on the questions, would be agreat help!!!