Ballograf Epoca
The iconic Swedish brand still makes classic designs from the ‘50s. Very nice click action. Lots of internal parts if you like taking pens apart.
Variants: A huge range of colors with and without a chrome look plastic body.
Refill: Proprietary Ballograf refill. Parker-style G2 refills can be hacked to fit this pen. Or the pen can be hacked to fit unmodified Parker-style G2 refills.