Here is a pen I made on a whim, which started as me deciding I wanted to make something from this tortoise shell resin. It evolved into something that is vaguely inspired by the vintage Parker Duofold. I threaded it for a Bock #8 nib, and tried to incorporate some of the elements of the Parker, such as the distinct barrel finial, ball clip, and knurling on the barrel and cap finial. I made the cap band and clip from argentium silver. Threads are triple lead, 3mm pitch.