I could be wrong on the year of 1989, that was just the information that I was given. Upon further inspection, it seems that 1989 is probably just a copyright date. Any way the serial numbers are 010691702 and 01069701.These were in an old building on a peice of property that was being sold.The owner at the time brought in a huge dumpster and was cleaning everything out because of a sale pending. Everything was going in the trash, these speakers, tables, chairs, a huge tv, tools everything.