The Olivetti Lexikon 82 was first produced in 1974 according to Wikipedia (1975 according to Olivetti Storia di’un impresa).
The element ball is slightly smaller than those made by IBM, TA-Adler/Royal, or Brother.
This instruction guide for the Olivetti Lexikon 82 is in poor condition, however the scanned pages (written in Italian, French and English) are legible. See the link below for the PDF (approx. 2.8 MB):
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E.T.ZONE 
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