You are Looking at a 1/3 zip Cycling Jersey(By Pearl Izumi).  I Give it a grading of 7,minimal wear for age, good shape. Made in Japan. Tag says size Medium, listed as a Medium.. may fit smaller(Depending on how tight/loose you wear your clothes)....Read Measurements(compare them to a piece you own and you will get an idea of how it might fit)....My actual measurements are as follows.  Top to bottom,24".  Across the chest, from pit to pit,19".