These models are similar to the one you are viewing.
double action, thumbrest grips, round hammer with spur, adj. rear sight, 6.1 or 8.1 in. barrel, 25.6 or 27.2 oz. Mfg. 1953-70.
.22 LR or .25 ACP cal., double action, 2.8 in. barrel, 6 shot, alloy frame, blue, fixed sights, plastic grips, 11 1/2 oz. Mfg. 1968-98 in W. Germany, U.S. import stopped by GCA of 1968.
9mm Para. or .40 S&W cal., first introduced before the QA, slide marked with QSA inscription, large decocking plate. Very few mfg.
similar to P99, SFO, except is double action only, features Walther's constant pull trigger system, black, QPQ slide finish, or Military Model (green), 25 oz. Mfg. 1998-2003.
.22 LR cal., 3/4 scale of the P99, 3.42 in. barrel, hammer fired, black polymer frame with grooved and stippled grip, SA or DA, matte black finish, military green frame or nickel slide, or brushed chrome slide and anthracite frame finish (disc. 2010), internal trigger lock with loaded chamber indicator and mag. disconnect, 10 shot mag., firing pin drop safety, safety key lock on right side of frame, interchangable backstrap, adj. rear (disc.) or 3-dot sights, 15.2 oz. New 2001.