O. H. SCHELL.--The ordinary English stamps were printed in sheets of 240. Each, stamp was different as far as the letters were concerned. The first stamp on the sheet bore A. B. in the upper corners, B. A. in the lower corners. The second stamp, A. C. in the upper, C. A. in the lower corners, etc. The second row bore B. A. in the upper, A. B. in the lower corners, etc.
H. D. GRAHAM.--The line under the word "Postage" in the Hartford die of the centennial envelope is single. In the Philadelphia die it is double. All revenue stamps and stamped papers are collected by philatelists who make a specialty of this branch. U. S. Locals and Telegraphs are largely collected. I never saw a Postage Due U.S. in blue. I presume you have an essay of proof color. Did you take it off of a letter?
W. T. FENNER.--The comparative worth of cancelled and uncancelled stamps varies, but as a rule the unused stamps are worth much more. In some instances, however, where large quantities were printed and only a few used, the proportion is the other way. A set of Postage Due U.S. of the current issue is worth face value only.
F. A. R.--The 3c. blue U. S. is 1869 issue, worth 1c. used, 15c. unused. The green centennial envelope is worth 25c.
R. BREHMER, 15 High Street, Rutland, Vt., wishes to exchange stamps, especially with foreign collectors.
E. R. BEERE.--A Mexican dollar has more silver than an American dollar, but is worth only half as much. The 1806 half-cent is worth 15c.
E. W. KEIFER.--The 1895 U.S. silver dollar is worth face only. The usual custom among numismatists is to obtain the fresh coins directly from the mint through a Philadelphia agent.
E. HALL.--Never cut a pair or a strip of unperforated stamps. They are worth more together than singly.
TOM C.--All the low values U.S. issued during the last ten or twelve years can be bought of any dealer at twice face value, with the exception of a few rare shades. The dealers at present have a full supply, and many smaller post-offices still have quantities on hand. Probably in ten years or so dealers will have sold the bulk of these common stamps (at constantly increasing prices), and will then be glad to buy the same stamps back at much more than they sold them for. Age has nothing to do with value. You can buy Roman copper coins nearly two thousand years old at 10c. or 15c. each.