I bought the host bike in March from a nice older lady via Craigslist. I'm not sure it was ever ridden much. There was only one mark on the frame, and the little braze-on screws were all in place and not rusty. She also had the owner's manual and the 1987 catalog. I didn't know anything about it before that - all I saw was Japanese lugged steel.
Checked the catalog just now, and the Prairie Breaker I in 1987 didn't have a biplane fork, so now I'm not sure what year this bike was made, though it was originally purchased 7/87. No Ground Breaker in the catalog.
Had to paint the door to cover up the ugly faded brown stain. It was the best we could do.