Westminster is, according to the sources used in the forum, a sub-brand of Montblanc and is listed, among others, on penexchange.de under Die Klassiker / Viele Namen - Ein Hersteller as well as at collectiblestars.com under Brands A-Z. In the book Penkala by Miroslav Tischler, Westminster also appears in the section Other Stationery Manufacturers in the World. The firm Westminster existing in the United Kingdom has nothing to do with this, since it has existed only for a few years. For a concrete model determination, it is recommended to additionally post the photos on penexchange.de, where such pens have already been discussed.