With the approval of the Postmaster General, postage stamps are sold to certain dealers to retail again to the public.
Pre-payment in stamps.
Pre-payment of letters should, in all cases where practicable, be made by postage stamps.
Mutilated stamps.
A mutilated stamp, or a stamp cut in half, is not recognized in pre-payment of postage.
Medallion stamps.
A medallion stamp cannot be accepted in pre-payment of postage if separated from the envelope of which it may have formed a part.
British and foreign.
No British stamps, or stamps of a foreign country, can be received in pre-payment of postage in Canada.
Mode of affixing.