AC's Weller-designed six entered production in 1922, helping to secured the marque's place in motoring history when in 1926 a 2.0-litre model driven by Victor Bruce and W J Burnell became the first British car to win the Monte Carlo Rally.

The six-cylinder AC chassis followed the lines of its four-cylinder contemporary, featuring quarter-elliptic springing front and rear, a three-speed gearbox in unit with the rear axle and worm final drive.

Front wheel brakes were optional at first, becoming standard issue from 1927.

Although the first sixes were running in 1919 it took some time to get production under way and most ACs produced immediately after The Great War were powered by British Anzani engines.

Rated at 12hp for taxation purposes, the four-cylinder AC remained in production until 1928, the firm relying exclusively on the Weller six thereafter.

This rare AC Six was purchased by the current vendor in 1972 and used successfully on VSCC rallies for the next few years, winning th...