According to the box this is the Swan Standard Fountpen, a name that harks back to an earlier era. The paperwork describes it as the Safety Screw Cap type – that’s a blast from the past! The barrel imprint calls it the Swan Safety Pen. Despite all the historic references I believe it’s a late pen, made sometime in the 50s.
It’s an eyedropper filler, most likely for the export market. Like Macniven & Cameron, who had Burnham produce an eyedropper filler for them around the same period, Mabie Todd (or rather Biro) were perhaps trying to break into the Indian market as home sales declined.
It’s a nice enough pen, only brought down by the gold-alike cap. The rest of the pen is in a very dark blue and the nib is up to the usual Swan standard – very good in other words.