8. Show one stamp in each of the following classifications.  Explain the purpose of each: regular postage, commemorative, semipostal, airmail, postage due, envelope, special delivery, precancel, revenue, postage meter labels, and air letter sheets.

REGULAR POSTAGE, COMMEMORATIVE, AIRMAIL, POSTAGE DUE, AND ENVELOPE:

BAHAMAS, 1977

Commemorative for the 6th Caribbean Scout Jamboree.  Design error: misspelling of "Carribean"

COLOMBIA, 1962

Airmail essay for unissued value.

SWITZERLAND, 1969

Postage due.  Circle T overprint indicates the due was paid.

AUSTRALIA, 1982
Pre-stamped envelope commercially used.

NETHERLANDS, 1937

The 1½d King George VI regular postage issue of Great Britain is shown since there are no regular postage Scout issues.  Shown is an incoming envelope to the V World Scout Jamboree with a 10 cent postage due stamp being tied by the special cancel for the Jamboree on August 8, 1937 to show the due being paid.