There are 10 sheets of vintage letterhead paper at 8.5" x 11".  These are all in good condition with no writing, folds, creases or tears. 

 

There is a watermark that says:

Fox River Opaque  25% Cotton 

 

The header says:

MacGregor Professional Golf

Brunswick Sports/4520 James Place, Melrose Park, Illinois / Fillmore 4-7633