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Photography Stamp - The stamp shows 

Niecephore Niepce (left), Louis J.M. Dagu
The stamp shows Niecephore Niepce (left), Louis J.M. Daguerre (right) and F. Arago (in the middle) while he announces at the meeting of Academie Francaise the invention of photography (January 1839). The stamp was issued to commemorate the 100th anniversary of photography.
Country:  France
Date of issue: 24 April 1939
Catalog Number: Michel 446, Scott 374
Type: Stamps
Philatelic Tips
Stamps often are available in a variety of forms like panes, souvenir sheets, mini (miniature) sheets, booklets, blocks etc. See glossary terms explaining the most important terms below:
Pane: The unit into which a full sheet is divided before sale at post offices. The "sheets" that one normally sees at post offices are panes. Most United States full sheets are divided into four regular panes or many more booklet panes before they are shipped to post Office.Pane: A full "sheet" of stamps as sold by a Post Office. Four panes typically make up the original sheet of stamps as printed.
Souvenir Sheet: An s/s for short, is a small sheet of stamps, usually including one value or a set of stamps. A souvenir sheet usually has a wide margin and a commemorative or advertising inscription and design.
Sheet: A complete unit of stamps as printed. Stamps are usually printed in large sheets and are separated into two or more panes before shipment to post offices.
Booklet: A unit of one or more small panes or blocks (known as booklet panes) glued, stitched or stapled together between thin card covers to form a convenient unit for mailers to purchase and carry. The first officially issued booklet was produced by Luxembourg in 1895.
Booklet Pane: A small sheet of stamps specially cut to be sold in booklets.
Miniature Sheet: A single stamp or block of stamps with a margin on all sides, often bearing caption or some special wording or design. Compare with Souvenir sheet.
Block: A unit of four or more unseparated stamps, including at least two stamps both vertically and horizontally. Most commonly a block means a block of four, or a block of stamps two high and two wide.
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