Rather than following the prior design of the Eco Clock Company line, with pin-prick registrations by tumblers, this version pricked the dial by a pin directly on the station key.  As with the "Accurate," the design required a shutter to make it more difficult to mark the dial falsely by access through the keyhouse. The direct pin design allowed the Detex Eco to be made almost entirely from Detex Newman components; the only differences were a pointed stud in place of embossing type on each key and a much simpler matrix plate in the clock.  Production of the Detex Eco had been very low post-World War Two and ended in the late 1960s.

When made in 1930, this clock contained a Bürk one-day movement.  In 1940 or 1941, a Chelsea eight-day movement was substituted, and a "Wind This Clock Friday" label was added to help assure that the clock would not run down over a weekend. The center-wind eight-day movement seen here was found to be insufficient and replaced by a more powerful Chelsea movement which is fundamentally the same design in use today,  produced since 1953 by Detex Corporation.

Interior view. Sticker reads, "WIND THIS CLOCK FRIDAY."