Shades
The difference between a major number and a minor number is not a trivial academic matter. Major numbers are needed by all collectors for completion and have spaces in all the major stamp albums. Minor numbers have only a few collectors searching for them so the difference in price is significant. Canada #16 catalogs for $5500 whereas many of the shades of #17 which are just as scarce catalog for $160. Why do some stamps get this special status? As far as I can tell (and I know this sounds cynical) it is philatelic politics. In the old days of the hobby when numbers were being assigned it really mattered who went to bat for which stamp and this was usually a factor of whether that collector owned the stamp in question or not. Today these catalog quirks have been enshrined in our hobby and are rarely noticed. But they are residuals of a day when the self interest of the editors had great influence on the listings.
