A great example of early Mt. Vernon Mouthpiece mouthpiece packaging used when shipping to customers.
Postmaster: If not delivered with 5 days
Vincent Bach Corp.
50 MacQuesten Parkway South
Mt. Vernon, NYContains MerchandisePostmaster: This parcel may be openedfor postal inspection is necessaryReturn and Forwarding Postage GuaranteedInsuredNo.
Mailmaster Pat. 1609279
The Mason Box Company
Attleboro Falls, MA
Mason Box Company is still in business, and still manufacturers boxes like the one shown.
Very similar packaging to the New York example found here.
source: Fred Cirksena, Quality Brass