10 Units uniface

The "10 Units" denomination is a curiosity — these are not circulating banknotes but internal test pieces produced by De La Rue for quality control and press calibration during the contract period. Switzerland's Schweizerische Nationalbank commissioned De La Rue for security printing work in this era, and specimen or trial printings in non-currency denominations were standard practice to avoid producing technically valid instruments during production testing.

Uniface printing — one side only — confirms the experimental nature. Roger Pfund, the Geneva-based graphic designer who contributed significantly to Swiss banknote aesthetics in the 1970s series, is credited here, though his design work on trials of this type would have served largely as template material rather than intended issue.