For Menno Hertzberger the addition 'Internationaal' to his firm's name was not just an embellishment: From the very beginning onwards his business was internationally orientated, and it aimed for a wide public of bookcollectors, librarians and fellow-dealers. As early as 1921 Menno held his first auction-sale and he soon became known as an important auctioneer as well. The growth of the firm necessitated a move to larger premises and in 1935 the firm's new address became Keizersgracht 610 in Amsterdam, a large and elegant house along one of the famous canals. Menno Hertzberger, the Father of the League, died in 1986. Bob de Graaf's obituary characterizes him as a truly international antiquarian bookseller and a man with a vision: to unite dealers worldwide under one roof, the ILAB.