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I don't really know too much on what branches issued stamps. Mostly I have ccommonwealth.but I'm interested in American stamps.
Not really sure of your question Newfie, but currently there is only one branch of the U.S. government that issues stamps, currently called The United States Postal Service.
Back in 1873 to 1884 there was an experiment carried out wherein Nine branches of the U.S. government all had varing amounts of stamps. They were;
Agriculture....9 values (stamps)
Executive......5 values
Interior......10 values
Justice.......10 values
Navy..........11 values
Post Office...10 values
State.........15 values..this department had $2, $5, $10, & $20 stamps
Treasury......11 values
War...........11 values... for a total of 92 different stamps.
To give you some idea of what they looked like, below are all nine 1 cent values. I used card proofs for this explanation, mostly because the Official spamps I collect are used, and sometimes harder to see clearly. I also colloect the proofs, as you can see.

