From the listing for this 1991 Ferrari F1 car for sale:

A 1991 Ferrari F1-91 (Type 642) leads the single-owner Willi Balz Collection at Bonhams. Although primarily known and acknowledged as auctioneers, Bonhams will sell the collection by the tender, otherwise known as sealed bid, process.

The Ferrari F1 offered has an enviable racing history. It was driven by the greats, Jean Alessi and Alain Prost in its 1990s heyday, racing at the Monaco Grand Prix, the Phoenix Grand Prix, the F1 Grand Prix Brazil, and the San Marino Grand Prix.

The 42 Lot inventory will be available for public viewing in the Stuttgart area, Germany, on Wednesday 21 and Thursday 22 September. The sale closes on Tuesday 27 September.