"The Berkshire Exchange, Cummington, Mass." is visible even with the stamps obliterating the rest of the address. I suspect it was delivered with that partial address, especially since Cummington is a town (even today) with a population of under 1000 people.
In its day (1920's to 1930's), "The Berkshire Exchange" of Cummington, Mass. was the publisher of this catalogue, which may help to further explain the reason for the cover:
Quote:
The American catalogue of air mail and first day covers
Cummington,Mass.: Berkshire Exchange, 1929.