The Model K sold for $750. Calendar year sales and production were 3650 units. The model year sales were the same number. The serial number was on a plate on the rear of body (with engine number). Engine numbers were stamped in two places on the crankcase: 1. Top, right edge of cylinder flange, near the water outlet. 2. Top surface of left, front mounting leg. It was also placed on a plate on the rear of the body (with serial number). (Blank spaces on patent plate are for additional patent dates, not engine or serial number.) Engine No.: 8350-10000.

The Model K was introduced on January, 1906. The chassis was the same as the 1905 models, except the spark control was now on the steering column and the oiler had a mechanical feed from a cam on the hub of the flywheel. Straight-side Dunlop tires were now standard equipment. The bodies were restyled. All 1906 one cylinder passenger car bodies were now the Victoria style. The dash was now pressed steel and the corners of the "hood" was rounded. This "hood" and dash treatment was used through 1908. 1906 cars can be identified by a long muffler and severe cant to the nose of the front fenders. The tops were not shown in catalogs but undoubtedly were available. Cadillac was setting up its own top department and would be offering Cadillac-made tops for 1907.