Esterbrook Estie Button Piston Fountain Pen Sea Glass Gold TrimA Spellbinding Treasure If you love bottled ink, you'll love the experience of filling your Estie with a button fill system. With our illustration shown below and a tiny bit of practice, you'll be filling your pen in no time! The Sea Glass reflects the coveted coastal treasures that wash ashore during low tides all over the world, known as sea glass. Shaped over many sunrises and sunsets, these bits of colored glass drift for hundred years, weathering