Illustrating all the postal rates during the Admiral era is a major task. As an alternative, here is a table of Admiral era rates attributed to Larry Paige and Allan Steinhart (see note 1 below) based on Allan Steinhart's 1981 book, The Admiral Era: A Rate Study 1912-1928.

Admiral Era Rates, 1912 to 1928

In effect on:	Jan 1, 1912	Apr 15, 1915	Jul 15, 1920	Aug 1, 1921	Oct 1, 1921	Apr 1, 1922	Oct 1, 1922	Apr 12, 1924	Apr 29, 1925	Oct 1, 1925	Jul  1, 1926	Aug 24, 1928	Dec 25, 1928
Domestic Forward - First Class	2¢	3¢									2¢
Second Ounce	2¢	2¢									2¢
Drop Letter - First Class	1¢	2¢									2¢
Second Ounce	1¢	1¢									2¢
Post Card Rate	1¢	2¢									2¢
U.S. & Mexico - First Class	2¢	3¢									2¢
Second Ounce	2¢	2¢									2¢
Post Card	1¢	2¢
Airmail												5¢
Second Ounce												10¢
Canada & U.S. Second Class - Single	1¢
Third Class - Single	1¢
British Empire - First Class	2¢	3¢			4¢						3¢		2¢
Second Ounce	2¢	2¢			3¢						3¢		2¢
Post Card	2¢
Second Class - Single	1¢
Third Class - Single	1¢				2¢
U.P.U. - First Class	5¢				10¢					8¢
Second Ounce	3¢				5¢					4¢
U.P.U. - Post Card	2¢				6¢					4¢
Second Class - Single	1¢
Third Class - Single	1¢				2¢
Special Delivery (+ Postage)	10¢			20¢
Registration (+ Postage)	5¢		10¢
A.R. Fee - At time of mailing	5¢				10¢
A.R. Fee - After					20¢
Dead Letter Return Fee	2¢					3¢
Money Packet (+ Registration)	2¢					6¢					5¢
Second Ounce	2¢					5¢					5¢
Unaddressed Printed Matter (Circular)	1¢								½¢
C.O.D. to $50 (+ Postage)							15¢
C.O.D. to $100 (+ Postage)							30¢
Business Reply Card								½¢

Notes:

1. In a telephone conversation on 22 November 2006, Larry Paige told me that he had nothing to do with compiling this table. He credited it to Allan Steinhart.
2. The 1928 airmail rate applied to both Canadian and U.S. destinations for which airmail service was available.
3. On 29 April 1925, the Unaddressed Printed Matter (Circular) rate was reduced from 1¢ to ½¢ per 2 ounces for delivery to box holders and households on a letter carrier's walk. The rate remainded at 1¢ for delivery on rural routes.
4. The covers on this page do not illustrate the rarest or most desirable rates in the table. Rather, they are just items from my collection that happen to be favourites of mine.