This group of fountain pen nibs last lived in the Sheaffer Pen Co in Fort Madison, however they are all in envelopes marked Radiant Point Pen Corp, 270 Lafayette Street, New York City. Each envelope is marked by hand with the nib number , brief info and the date 6-12-40. It seems reasonable that Sheaffer was perhaps exploring nib makers for gold plated nibs at this time. Each marked Warranted Iridium Tip.