Wide and narrow duplexes

A duplex is the name given to a binder with two sets of rings.

There were two types, although this was not evident from the model numbers (both D2CLF). Filofax said the narrow one was designed to fit into the leg pocket of a soldier's trousers, which seems viable. Filofax was popular in the military.

These were offered in whole range of materials, but both the ones shown here are made of calf leather.

Done