Selvage Factor

On a printed sheet of stamps, the selvage is the margin at the edge of a sheet. The selvage can also be printed on, which can further distinguish the stamp if it is left attached.  I have defined some new terms in stamp nomenclature, of which there are hundreds.  The Configuration Number (CN) is a value given to a stamp configuration according to its position on a sheet. It is a measure of uniqueness.  From this you can calculate the Selvage Factor, which is a multiplier of the stamp's value. It is found from the number of stamps per sheet (SS) divided by the CN. For this to work you need to see the whole of an undisturbed sheet. 

I have two examples. My Bobcat config has a CN of 2 ie it only appears on the sheet in 2 locations and the Coral Island is a 5.  Therefore the Bobcat SF is 20/2 = 10 and the Coral Island SF is 15/5 = 3. So finally according to the catalog, the double Bobcat is worth $13.47 so now is $134.70 as it is 10 times harder to find with this selvage attached. Also the Coral Island now moves from $5.32 to $15.96.  Too bad I do not have the stamp in the top right corner. It has a CN of 1 and 15 times rarer than the straight stamp. 

Some stamp sheets are smaller and more manageable with 10, 15 or 20 stamps and there are collectors who buy whole sheets. However some contain up to 100 stamps per sheet, yet somewhere on the sheet will be a single stamp with the same config number of 1, equivalent to the whole sheet, just because of the selvage. Eg left centre below on this sheet

The 1 on the selvage is slightly obscured

My configuration above appears 5 times

I haven't looked for a sheet copy on this one yet