Agree Fernando, possibly early 19thC.
Steel nibs were first commercially manufactured in 1822.
From the Itinerant Scribe site:
You find history’s first hint of metal nibs in a 1792 ad, The Times offering ‘New invented’ metal pens. Then in 1822, John Mitchell of Birmingham, England, began making large quantity steel pen nibs. They were easily produced, affordable, had uniform tip sizes, outlasted quills, and didn’t need recutting. They soon became the favored, replacing the long-serving feather quill.
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