J pen

noun

noun

Historical A kind of fountain pen with a broad, stubby nib, originally stamped with a "J".

The calligraphy was, like the paper, unusual, bold, decided, and, I should have guessed, produced by a J pen.1897, Richard Marsh, The Beetle:
[A] few days later, on his way to the football field, he went into a shop and bought a pennyworth of J pens.1915, W. Somerset Maugham, chapter 12, in Of Human Bondage:

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