No, it is an after-market job. Too bad; those older DA Colts are beginning to catch on with collectors when they were scorned for so long.
The Army Special was made in .38 Special, .32-20 and .41 Colt. Yours would date to 1911. It was the successor to the New Model Army and Navy revolver and was followed by the Official Police which was the same gun only with the name changed.