Green’s Dictionary of Slang

stamp-picker n.

[printers’ jargon stamp, a piece of type]

a typographer, a compositor.

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[Aus]Bulletin (Sydney) 24 Jan. 7/1: [A] young lady, named Ruth Whiting, who is now engaged as a ‘stamp picker’ in a newspaper office […]. Ruth was not always a comp.; in fact, she was evidently originally intended for far greater things.