Hi Nelson
I purchased a very nice hand book called(Cape of Good Hope Triangles 1853-1864)How to tell if yours is real. A 5 minute guide by Greg Allan,it full of information on how to tell fakes from the real stamps.And listing them by SG numbers.Also any new information he obtains ws forwarded to you as PDF files so you can add them to your book.I can scan a page for you if you would like.
I hope this helps.
Brian
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