Introduced at the 1934 Olympia Auto Show, the series 3 Mark II or MKII was in effect an improved Le Mans model. The 'evolution' was significant with body, chassis, and engine changes. Compared to the previous models, the Mark II was stronger due to deeper chassis rails and the road holding was also improved. To cut production costs, Aston Martin relied on third-party suppliers for various parts.
The 1.5 liter 4-cylinder single overhead cam engine now developed 73 horsepower.
Again two chassis lengths were available, long for saloons, tourers and drophead coupes, short for 2 and 2/4 seater sports cars.
Three standard bodies were available; an open 2/4 seater (61 cars built), a full four seater (45 cars built) and a fixed-head 'Sports Saloon' (24 cars built). Priced at a hefty 700 Pounds, the Sports Saloon was the most expensive model in the range.
Some examples of an more luxurious drophead coupe were also built to special order.
Almost all Mark II chassis were clothed at the neighbouring Enrico Bertelli coach-building facility.
The Mark II could be easily identifiable from its predecessor due to the use of vertical thermostatically controlled radiator shutters. Cycle type front winds were retained which still turned with the steering.

The short chassis from the Mark II together with a modified engine and lightweight 2 seater body was used as Team cars and ultimately became the Ulster.
The 2/4 seater based on the shorter 8’7” chassis was also the most successful and best selling of the 1.5 litre cars with 61 completed over a period a little under two years. Soon after the 2-litre model was introduced and not much later A.C. Bertelli left the company.