Hello everybody, I recently found at an old stationery in the Genoa hinterland an Alba Duplex vintage fountain pen; it is cartridge/converter filled. When I started maintenance actvities on it, I noticed the converter is different from any one I know. The outlet's inner diameter is 4mm, the outer is 6mm; I am posting here an image where the cartridge outlet is compared to a standard international one: http://farm6.staticflickr.com/5338/9004520611_387a870773_b.jpg Alba Converter di S.R.GE, su Flickr Can anyone help me to find out if there is a contemporary converter type that can fit the old one? Thanks a lot! Sergio