The best extra fine fountain pens

Platinum publishes the nib width in millimeters, which almost nobody else in this category does. That single fact makes the Preppy the cleanest reference point on the whole site: when we say a Japanese Fine is about 0.3 mm, this is the pen we can point at.

The slip-and-seal cap is the other reason it matters. Platinum's cap mechanism keeps the nib from drying out for months, so a Preppy left in a drawer usually writes on the first stroke — the failure that puts most beginners off fountain pens for good.

It is still a cheap plastic pen. The cap cracks if you post it hard, and the body is not built to survive a bag full of keys.

The Kakuno was designed for Japanese schoolchildren, and every design decision follows from that: hexagonal so it stays put, a face embossed on the nib so you can see at a glance whether you are holding it upside down, and a nib tuned to be forgiving rather than fast.

It shares a nib family with the Metropolitan, so the writing experience is closer to that pen than the price gap suggests. What you give up is the brass body and the sense of occasion.

The cap does not post, which is a real annoyance for anyone with large hands — you either hold a slightly short pen or find somewhere to put the cap.

Pilot, Platinum and Sailor are the three Japanese houses that matter, and Sailor is the one most beginners never meet, because its reputation sits at the expensive end and its cheap pens are thin on the ground outside Japan. The Lecoule is the exception: a genuine entry-level Sailor with a real Sailor steel nib.

It matters to this site for a specific reason. Sailor's listing states a 0.3 mm line width, which is the same figure Pilot publishes for the Kakuno Fine and sits between Platinum's 02 and 03. Three Japanese makers publishing a number is what makes the Japanese half of the nib-width picture checkable at all.

What you are not getting is the ink system. Sailor uses its own cartridge, so a Lecoule joins the Pilot and Platinum lock-in rather than escaping it, and the converter is a separate purchase.

A published 0.38 mm is genuinely useful information, and almost nobody at this price gives it. It is narrower than a Japanese Fine, which makes this one of the few sub-fifteen-dollar pens you can buy for small handwriting with any confidence about what will arrive.

The nib is hooded — most of it is covered by the section, with only the tip exposed. That design keeps the nib wet and slows drying out, which is why the original Parker 51 used it.

The cap pushes on rather than screwing. That is the one specification here we would rather was different, because a friction cap is the cap that works loose in a bag.

The brass body is the reason this pen feels like it costs more than it does. It gives the pen weight in the hand and a cold, solid grip section, which is the single thing most people notice moving up from a plastic school pen.

The nib is a Japanese Fine. That matters more than the letter suggests: Japanese grades run narrower than German ones, so a Pilot Fine lays a line closer to what a European maker would call extra fine. If you write small or on thin paper, that narrowness is doing you a favor.

The catch is filling. The Metropolitan takes Pilot's own cartridges, not the international standard ones every other brand shares, and the converter you need to use bottled ink is a separate purchase.

The Liliput is a plain metal cylinder that tapers at both ends. There is no clip, no window, no printing beyond a small mark on the cap - which is the entire point.

It is genuinely tiny, and that is the trade. Posted it becomes a normal-length pen; unposted it is too short for most hands to write with comfortably for long.

Like the Kaweco Sport it takes short international cartridges, so refills are easy to find - the cartridge compatibility guide covers which standard is which.