Hi Pooh

The KGV penny red Roo is the most comprehensively studied stamp in Australian Philately.

The are numerous varities, some common, some not so common.

It would really be a good option for yourself if you purchased a Copy of
The Australian Commonwealth Specialist Catalogue KGV, especially if you have a lot of KGV ROO stamps.

It is illustrated in colour and you will spend hours just comparing what you have with the photos in the catalogue.

This catalogue explains all the variations in watermarks, as well, and also the different papers, but determining the different types of papers is a expert job as well.

The adress where you can purchase it is
Brunsden White
PO BOX
BROADWAY
NSW 2007

Their email address is info@brunsden-white.com.au
Regards
Horamakhet

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