pen in

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References in classic literature ?
repeated Mr Brass, grinning again with the pen in his mouth, like some nobleman's or gentleman's crest.
One of them, with both elbows on the table, and a pen in her hand, was tracing characters upon a sheet of fine Dutch paper; the other, kneeling upon a chair, which allowed her to advance her head and bust over the back of it to the middle of the table, was watching her companion as she wrote, or rather hesitated to write.
You may imagine how my spirits are improved when I can occupy my pen in writing such nonsense as this