Forty years ago Gordon and Jill Cowan purchased JT Mowatt & Sons stationary store at the west end of Baker Street. Four decades later, Cowan Office Supplies is going stronger than ever. When the Cowan family purchased the business in 1972, it was a small operation. In 1976 they moved the business to the current location at 517 Victoria Street. Today the business is a force in the stationary, office and art supply business offering a wide range of products and services. On Wednesday morning the crew at Cowan’s — which today is run by Paul and Andy, two of the eight Cowan children — gathered to cut the cake along with Mayor John Dooley. The store is offering anniversary specials all week long.