Waterman's 0552

I got this set at the 2018 San Francisco Pen Show. It is an overlay variant of the 52 model - - the so-called "basket weave" pattern. As shown from the catalog below, this model was offered in several different overlay patterns and finishes.

Richard Binder has a complete biography on this model of pen which can be found here: http://www.richardspens.com/ref/profiles/52.htm