For some time the two brands were produced together, the [[Mentmore]] was transformed into a joint stock company in [[1930]]. It is not clear the situation at that time, there are those who reported that the [[Mentmore]] brand has been progressively replaced by [[Platignum]], but by the late '30s to the '50s, there is still a large production of pens with this brand. | For some time the two brands were produced together, the [[Mentmore]] was transformed into a joint stock company in [[1930]]. It is not clear the situation at that time, there are those who reported that the [[Mentmore]] brand has been progressively replaced by [[Platignum]], but by the late '30s to the '50s, there is still a large production of pens with this brand. |