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From the maker's serial number records you piano was made in 1982, so it is around 34 years old and not quite as old as you perhaps thought. At 44 inches high it is classed as a Studio Piano
From the comprehensive information you have given it seems that it is in reasonable shape for its age and the amount you paid. Without seeing the condition of the hammers and other parts which can deteriorate with many hours of regular use, I cannot be sure but it may be that it has been well used in its past, which would perhaps account for the price and that some work may now need to be completed to bring it back in to full working order.
For the repair/restoration work please have a look at this website:- www.ptg.org which is the Piano Technicians Guild. On this site you should find someone, hopefully quite near to you.
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