The bottle in question is most likely the Parker Penman, which is no longer regularly available in that exact form. A virtually identical bottle is supplied today with the Parker Duofold True Blue, but buying it as a refill is expensive. Similar designs with plastic insert, refill funnel or a collection well for ink residues are offered by Levenger as well as Lamy, Sheaffer and Visconti in their ink bottles. Levenger inks and similar specialities are easy to obtain through Rolf Thiel (missing-pen.de); the assortment is broad and individual advice is possible. Anyone looking for a specific bottle can ask there directly.