Yet another application of Eberhard Faber’s clamp eraser design, this time as end-caps for a tube of Microtomic replacement leads:
The label mentions Wilkes-Barre Pennsylvania, which means that they were made no earlier than 1957 1956 (when the Eberhard Faber Company moved from Brooklyn to Wilkes-Barre).
It’s similar to a much earlier design from the 1920s and ’30s, and I wonder to what extent they were practical as erasers:
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