It was bought in Easton, PA from what I’d guess you’d call a scrap dealer. Not the original owner. Did your shop not install decals back then? This could easily have been one you sold! How cool. And it still is a great bike! If I didn’t have so many already I’d totally be keeping it.
The shop I used to work for always installed a shop decal. At the time these bikes were new, I was the sales rep for WSI, who owned/distributed Diamondback and Centurion. I covered NJ and North Eastern PA, so I was traveling around to the shops selling them bikes/parts. Those were the highwater years of DB for sure, and it was cool selling the DBR line of high end aluminum and titanium frames/bikes. Even got to meet and hang with the old team members Dave Cullinan, Dave Wiens, Gunnar Shogren, and Susan DeMattei at shows ad meetings. One of the old racers, who became the team manager, Keith Ketterer (KK), is actually now my inside sales rep at Giant in California....
This is one of the older cool production bikes, and a nice period piece. I collect this sort of vintage for our collection at the shop, trying to preserve some of the old stuff...Once something goes into the collection, it is officially retired and not used again except for (one day) display and reference. Hope it goes to the right/good home!