Stipula Nettuno Idra.
They are beautiful pens to behold, but Stipula's design of the convertible filling system resulted in too-thin barrel wall at the threads for the section, and the barrels were prone to snap in two with just a twist. Ron Zorn was already repairing a Nettuno Idra for another collector when I brought him mine (that had snapped in half in the hands of a well-known nibmeister at a pen show). Unfortunately, the repair necessarily ends the convertible filler function. I took quite a loss on that one.
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Couldn't find my photos of the pen; the box will have to do.
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