Ayrton Senna-signed F1 helmet visor, the clear plexi-glass surface bearing his signature in black marker pen, the visor without fittings or sponsor's

Ayrton Senna-signed F1 helmet visor, the clear plexi-glass surface bearing his signature in black marker pen, the visor without fittings or sponsor's sunstrip, but signed personally for a Formula 1 Team Lotus mechanic. Provenance: as purchased in 1992 at a Mencap charity auction at the Plant Hotel, Doncaster, organised by the then Chief Constable of Sheffield, the item donated by a Team Lotus mechanic also from Sheffield.