It could mean that the stamp is unknown in used condition. In other words, the stamps were printed but were never actually used for postage - and probably never for sale in a post office. There could be a few reasons for this, such as the stamps were invalidated after printing but before they made it to a post office, maybe due to a rate change, an intervening war, etc.
It could also mean that there is not enough information about the stamp for the catalog editors to assign a value to it. Rare stamps that are only sold every couple decades or so sometimes are treated this way.
This stamp stuff is exciting. Kinda hard but there seems to be something new on every stamp. I sure wish they had consistent colors around the globe though.
According to the Scott Editors "The absence of a retail value for a stamp does not necessarily suggest that a stamp is scarce or rare. A dash in the value column means that the stamp is known in a stated form or variety, but information is either lacking or insufficient for purposes of establishing a usable catalog value.
Stamp values in italics can refer to expensive items that are difficult to value as they may not come up for sale very often. Italics for lower value stamps indicate a Caution where often the used variety is more expensive & the cancellation may be false - so buyer beware.
Also depending on the publication year, they will show a set minimum price, my 2009 edition is $0.20. This reflects the dealer handling charges and not the value based on scarcity
An example of stamps that are not valued in used condition because they were never used are the last stamps of the various German colonies. The issues were printed right before or during WWI and they were available for sale to collectors, but before they could reach their intended post offices, the colonies had been lost in the war or cut off from supplies. Of course, after the end of the war, Germany was permanently stripped of all her colonies and those issues became permanently invalid for postage. Today, most of those stamps are relatively inexpensive in unused condition, but they don't exist in used condition.
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