It is not the oldest, but since I have shared an old catalogue of French origin and another of German origin, it will be sharing all the old catalogues of Venezuelan stamps that I find around.
In this case, it is a very very complete catalogue, published by The Scott Stamp and Coin Co., Limited, in 1890, and was authored by Henry Collin and Henry Calman. Its name is:
A Catalogue for Advanced Collectors
of Postage Stamps, Stamped Envelopes and Wrappers
It shows our stamps up to the official stamps of 1899 and many local stamps of La Guayra-St., Thomas.
It also shows, at the end, a section for the identification of some fakes.
Finally, it ends up showing a series of stamps that they did not know, but left as a reference. They assumed, cautiously, that they’re just fake or fantasy.1890-A-Catalogue-for-the-Advanced-Collectors-min