The Perfin Society. Goal, to record all British perfins.
http://www.angelfire.com/pr/perfinsoc/Stamps are of Queen Victoria, QV, Queen Vickie, etc.
Stamps
1884 Stanley Gibbons #188 1-1/2d Lilac = Used GBP (Great Britain Pounds) 35.00 = USD $50.00 from SG Concise 2005
Watermark Inverted = GBP 180.00
1884 SG #194 6d Dull Green = Used GBP 200.00 .
Watermark Inverted Sideways add another GBP 100.00 approx.
Nice cancels by the way.
Not sure if the eprfins would devalue or add value, depending on the collector I suppose.