Opus 88 Demonstrator Fountain Pensearch

Opus 88 Demonstrator Fountain Pen

Opus 88 Demonstrator Fountain Pen

Where's the price?
To negotiate the best possible price for our members, we must agree to hide our prices externally.

Eyedropper Pen With Handy Shutoff Valve

For anyone seeking a traditional eyedropper-filled fountain pen, the Opus 88 demonstrator has a lot to offer. It features a combination of clear and frosted resin, so you can see the ink level and the nib when the pen is capped. But what really sets the Opus 88 apart is its piston-operated shutoff valve. The ebonite piston and rubber gasket seal the feed off from the barrel when fully depressed to prevent leaking and burping. Unscrew the blind cap and loosen the rod at the rear of the barrel to open up the ink flow to the feed. During long writing sessions, you can leave the shutoff valve open to take advantage of the pen’s large ink capacity. 

Note: At checkout, you’ll have your choice of nib size: fine, medium, broad, or 1.5mm stub.


  • Opus 88
  • Clear and frosted resin body
  • Screw-on cap
  • Stainless steel #6 JoWo nib
  • Eyedropper fill
  • Piston-operated shutoff valve that prevents leaking and burping
  • Max ink capacity (eyedropper): 3.56 ml
  • Diameter, barrel: 0.6 in (14.9 mm)
  • Diameter, grip: 0.4 in (11 mm)
  • Length, capped: 5.8 in (147.6 mm)
  • Weight, uncapped: 0.6 oz (17 g)
  • Weight, capped: 1 oz (27 g)


  • Glass eyedropper
  • Gift box


All orders will be shipped by Massdrop.

Estimated ship date is Jan 4, 2019 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.