This may be of interest for those looking at TWSBI alternatives. I've had great luck with TWSBI (no cracks yet) and so-so luck with WingSung (one cracked badly). Others have had the opposite experience.

From top to bottom: WingSung 3008 (~$3.75 USD), TWSBI ECO (~$35 USD), WingSung 698 (~$25), TWSBI Diamond 580 ALR (~$65). All are piston fillers, all seal really well. 3008 feels flimsy but works OK. Others all feel solid. No stub nibs on WS, though.

Photo of four fountain pens:  From top to bottom:  WingSung 3008 -- Clear with silver accents. Clear smooth round cap. Clear smooth round body, filled with red ink. Piston plunger is tan. Piston knob is clear.  TWSBI ECO -- Cerulean Blue with Silver accents. Flat faceted opaque cap is cerulean blue. Clear smooth round body, no ink inside. Piston plunger is black. Piston knob is opaque cerulean blue.  WingSung 698 -- Clear with silver accents. Clear smooth round cap. Clear smooth round body, no ink inside. Piston plunger is black. Piston knob is clear.  TWSBI Diamond 580 ALR -- Clear with black and silver accents. Clear smooth round cap. Clear diamond faceted body, no ink inside. Piston plunger is black. Piston knob is clear.  Beneath the photo is a centimeter ruler with a photogrammetric scale.

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