While the bulk of AC’s production consisted of comfortable, sporting family saloons, it is the open cars which the public remembers—and which form the bulk of Jim Feldman’s collection.

Ongoing development of the 1919 single-overhead-camshaft engine designed by John Weller continued to increase horsepower to keep the saloons competitive; happily, this also made the lighter, nimbler open ACs even more enjoyable to drive.

The Weller-designed six in this 1937 16/70 Drophead Coupe shows another interesting variation.

A pair of “Servais Noloss” expansion chambers attached to the exhaust manifold shows that AC, having paid attention to the intake side a few years earlier when three SU carburetors were made standard, now was giving some attention to the exhaust side of the crossflow cylinder head.

Jim Feldman’s 16/70 Drophead Coupe is attractively bodied with room for four.

It is silver-grey with inviting dark blue leather upholstery and interior trim panels.

The cloth top is black, with...