Traditionally, the Peugeot model with Reynolds 531 SL/Professional was the PY10. I believe this is what you have. The serial number indicates 1988 manufacture, so it could be a 1988 or 1989 model. By this time, the US models had dropped the number designation and were going by names, with the 1988 531P model being named Sante, after it's Shimano component group. There was no US 531P model in 1989. Since Sante was not available in white and did not have a chrome fork, I believe that you have a European version, which was still called the PY10.