First of all you have to be sure it is 'rare.' There are hundreds of six cent stamps that have been issued, some well over 100 years old. They could be worth anything from 6 cents for postage if unused to hundreds of thousands of dollars.
The first US 6 cent stamp #115 was issued in 1869 and the mint version can be purchased for $1,750.
There is a 1909 #362 that is worth $18,000 if used on envelope.
Most of them are not rare , but in used condition are worth more than the smaller stamps -- around 1/2 cent to 1 cent wholesale.
what is the value of a sheet of c m Russell stamps 1963
There is a lot of variety in asking about a 'two cent stamp.' You will have to determine a lot more about it to determine value. Consult a postage stamp catalog, usually available at your local library for exact identification and catalog values. Most used US postage stamps are worth 15 or 20 cents, the minimum amount required to catalog and stock the stamps. Unused will always be worth at least their face value. Special cancellations and different values are likely to be worth more. If it is truly an old stamp, it could range in value to a couple of dollars. If it is a really rare variety, it could be worth much more!
An 1828 penny can be worth up to about $40.00. It is the large cent penny, so it is quite rare today.
A 1919 Lincoln cent is not rare or even scarce. Average circulated coins are worth about 10 cents.
Depends on the face value and the numismatic value. Stamps are denominated in values from 1 cent to $1. The half-cent and quarter-cent stamps have been discontinued. Some rare 24-cent-denominated stamps cost $1 million. First-class letter will require 42 cents postage for first ounce, 17 cents for each additional ounce.
A Euro 20 cent coin dated 2000 is still worth 20 cents in 2014, unless it has a very rare defect that would make it collectable.
You must have a rare Shield 2 cent coin - a 1865 coin in good condition (G4) is worth: $16.00. fine condition (F12) is worth: $24.00 very fine condition (VF20) is worth: $28.00
A Euro 20 cent coin dated 2000 is still worth 20 cents in 2014, unless it has a very rare defect that would make it collectable.
As these are very rare they are fetching upwards of £500
...1 cent. Pennies made after 1982 no longer have much copper in them and the actual bullion value of them is less than one cent. There are no rare Lincoln memorial pennies except for errors.
Although there are rare stamps, in general WWII food ration stamps in a book of stamps (with some missing) are worth $2 to $5. An absolutely new book of stamps (unsigned) might be worth $10 or more. A book of stamps signed by someone famous would, of course, be worth even more. Loose stamps (not in a book) are generally worthless - a few pennies, if that.