1991/92 Grasshopper-Club Zürich Home Shirt (Match Worn?)

What appears to be a match worn or player issue shirt from a season that saw Grasshoppers finish 3rd in the Nationalliga A.
 
Shirt in a great condition. The number is heat pressed on and the label is similar to another example of this shirt. There are a couple of feint marks on the front (picture 5).