This Department is conducted in the interest of stamp and coin collectors, and the Editor will be pleased to answer any question on these subjects so far as possible. Correspondents should address Editor Stamp Department. This Department is conducted in the interest of the readers of HARPER'S ROUND TABLE--(1) To give the _important_ stamp news of the day; (2) to assist the young collectors to collect _intelligently_ by giving them hints on those subjects which are usually so difficult to understand, such as perforations, water-marks, papers, colors, methods of manufacture, varieties of dies, and the care and management of their philatelic treasures: (3) to answer questions in this column, or by letter, provided a stamped and addressed envelope be enclosed with the inquiry. I hope, however, all collectors will provide themselves with a catalogue, sold by all stamp-dealers, as this will in itself answer such questions as "What is the value of a ---- U. S. stamp?" MOLLIE DAVIS.--The stamp is catalogued at 2c. LANTIE V. BLUM.--I advise young collectors always to buy stamps from well-known, respectable dealers. See our advertising columns for names. C. P. MCKILLOPP.--The 10c. green U. S. 1851 unperforated is worth 60 to 75 cents. The same stamp perforated is worth 25 cents. The 10c. 1861 is worth 5 cents; the same stamp grilled is worth 40 cents. The 6c. Lincoln 1870, grilled, is worth $4, but without grill 2 cents. F. G. CLAPP.--The Richmond stamp is a fraud. Look a little sharper, and you will find the 2c. current issue with a white line inside the frame of the triangle. There is a new issue of U. S. envelopes. The water-mark has been changed. L. H.--The gold coin has no premium, owing to the monogram. I should prefer to see the Blood, Boyd, and Bouton stamps before making any definite answer, as you do not give the dates of the letters to which they are affixed. MURRAY CAMPBELL.--The various Confederate bills are worth very little. The stamp-dealers sell them very cheaply. E. P. TRIPP.--The revenue-stamp is worth 2 cents. The 1c. 1851 _without_ the outer line at the bottom, and the same stamp perforated (1856) _with_ the line are the scarce varieties. ROY THOMPSON.--There is no premium on the fractional currency used during the war, unless it is perfectly fresh and has never been circulated. C. G. ATHERTON.--Sverige means Sweden. The French stamp is a revenue, not a postage-stamp. The Brazil is a newspaper-stamp. E. C. CROSETT.--The scarce variety of the 7c. 1870 U. S. is the one without the line around the inner circles of the bulb. J. K.--The Kew-Kiang, Wuhu, etc., are Chinese local stamps, and were issued primarily to sell to collectors. I would not advise buying them, as, speaking philatelically, they are simply trash.