Pramberger Model PF110
Young Chang is based in Korea. Information on the Pramberger model is  that in 1995, Joseph Pramberger (former Vice President of Steinway and Sons) joined the company and brought certain innovations, creating the Pramberger brand.
 
Dark walnut case with matching original bench
2000, Serial # YO2459660
56 " width x 43.5" heighth