@Chaosweaver When I was making pens regularly, I experimented with pretty much every finishing process there was. Many worked well and looked good at the outset, but after months of handling, wore off. Polymerized tung oil lasted quite a while. Many use CA glue as a finish. It is very durable, but look a bit too “plastic” for my taste.
This one is not finished at all. I clear coated it in lacquer to seal the carve so that the dark stain wouldn’t bleed. After the stain, I sprayed it clear again just to see how the contrast worked. Since this one is not a keeper, I won’t be doing any “permanent” finish on it.