While doing research in the MIAT museum library I discovered two Belgian type specimen books by Vanderborght & Dumont type foundry.
First one is a well produced comprehensive specimen with a large section of Elzevir, and ornamental faces plus a large section (109 leaves) of decorative material. The book is 22x28cm and in a very good shape. The second specimen is not in perfect state, some pages are missing.
The type foundry was established in Brussels by Michel-Joseph Vanderborght (1801 - 1870). Vanderboorght optimized the typecasting manufacturing by having a cooling system to double output of the characters.