Funny that it was already salvage in 1987! You sure you don't have it backwards - the computer was '87 vintage but you got it later? That's when my father bought our first (new!) computer & it was a "turbo xt" (8 or 10mhz 8088).
The very first PC/AT was at most 3 years old at that point & still worth a couple grand. Any 286 would be at least mid-range, as a 386 would probably still cost high 4-figures $.