The a,b,c,d,e & f are as follows a=Imperforate d=Part Perforate meaning Imperf on top and bottom OR Both sides. c=old Paper (what most are) d=Silk Paper (small silk thread pieces in the paper. For the most part only visible on the back. e & f=Others that do not fall into the above like Ultramarine, errors of color, Double Transfers, etc.
Thanks for the info. Just spent the last hour or so reading revenuecollector's website. I then looked at the database of the collection and realized that I have 871 lines of revenue stamps (some with multiple copies per line) way too many to relook/reevaluate at this time.
Be glad to post pics if you ask, mint or used, single stamp or page.
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