10 Euros - Henri I State Bank

Luxembourg's 2006 bimetallic commemorative series pushed into genuinely unusual metallurgical territory — titanium centres were rare in European commemorative coinage at the time, requiring separate pressing and joining steps that most mints avoided for cost reasons. Henri I, Count of Luxembourg, secured papal recognition of Luxembourg as a county in 1083, a moment that effectively established the territory's political identity distinct from the broader Holy Roman administrative structure.

KM#99 is one of several issues in the series pairing titanium with a silver ring, a format the Luxembourg mint used across multiple historical subjects in the mid-2000s.