Omas Vintage Paragon Arco Verde with extra-fine nib. I would be the first person to tell you that green is not my favorite color. But some of my most beautiful pens are green, including this one.
This is not a vintage Omas: rather, Omas continued to produce this older body style in limited editions denominated “Vintage Paragon” after changing the Paragon to a larger pen with metal section.
Arco celluloid came in brown or green. It shimmers as it catches the light. There’s not much like it.
In celebration of the spring, I’m using the lovely Caran d’Ache Delicate Green. It’s light and bright, but legible even from an extra-fine nib.
Fountain Pen Follies 
I agree with Jon. Exquisite!
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That may be one of the most beautiful pens ever, each element in perfect proportion. I may have a fondness for it over the brown. Loved seeing it! 🙂
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Green is one of my favorite colors for everything except ink (although, you’ve lately cured me of my dislike for green ink!) And I also have a soft spot for pens with a vintage aesthetic. So this is great! And the ink is so beautiful. It’s like the Herbin Bleu Azur but in green!
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Pretty, though I would not choose green either…blue, ocean blue!
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