Modifiche

In the first half of '20s  the [[Columbus 670]] model, very similar to [[Waterman 42]], was introduced. It was produced in three size, normal, thin, and ladies,  and in black, red or [[mottled]] hard rubber. The range of available [[overlay]]s was also expanded, and to the simple machine engraving were added decorations or bas gallery and this kind of work became one of the strengths of the company. There is a remarkable production of this pen with an engraving of the David star on the body of the pen (also listed on the packaging) as a result of an agreement between [[Columbus]] and the Milan ghetto.

In the first half of '20s  the [[Columbus 670]] model, very similar to [[Waterman 42]], was introduced. It was produced in three size, normal, thin, and ladies,  and in black, red or [[mottled]] hard rubber. The range of available [[overlay]]s was also expanded, and to the simple machine engraving were added decorations or bas gallery and this kind of work became one of the strengths of the company, so that they sold also [[Waterman]] and [[Montblanc]] pens with their [[overlay]]s.<ref>as shown in [[:Categoria:Columbus-Catalogo-Safety-192x|this catalog]].</ref> There is a remarkable production of this pen with an engraving of the David star on the body of the pen (also listed on the packaging) as a result of an agreement between [[Columbus]] and the Milan ghetto. The same symbol appears in other models.