attractive collection of many hundreds in a binder on homemade pages arranged alphabetically by types, including Kleinrondstempels (small circle) and Grootrondstempels (large circle), begins with first issue imperforates with "Halfrond" types A-C, followed by Langstempels (straight line), amazing assemblage of neat socked-on-the-nose cancels, fine to very fine, practically impossible to duplicate, excellent condition