Bill is correct. 1st Gen. CA advertised the OFF DUTY as the same internals/action as the "very popular" UNDERCOVER with a matte stainless or black "military" finish and at a lower price point, (obviously lower cost due to lack of polishing.) The Model OD was introduced in 1981 - shortly after CA increased the quality of fit and finish of their entire handgun line and raised prices to reflect the extra cost. The OFF DUTY model will also have a red, plastic bead inset into the front sight blade on the earliest examples.