Root Range Master info needed

[osiristheclown]

I have a Root Range Master I would like some info on. The specs are 66", 30# @ 28", serial # M5144.  Can anyone tell me when it was made? The string is looking pretty bad and needs to be replaced, seems to be right about 60" overall length. Can someone suggest a string type/material and the proper brace height? Any info would be much appreciated, a web search produced very little info. Thank you in advance.