Canada 1927 Dupont Shoot Powders Hunting Advertising Cover Amherst

Dupont Shoot Powders illustrated advertising cover, franked with 2c Confederation, tied by Amherst slogan cancel (Dec 1), to Glenholm, Nova Scotia, with further printing on back "the proper powder for the proper load" with "Standard Loads of Dupont Shotgun Powders" chat, stamp slightly trimmed from opening, else a fine and scarce cover.