Walther Arms 503600 PPK/S 10rd 22 LR Nickel Polymer
http://www.tandktactical.com/shop/723364200717-walther-arms-503600-ppk-s-10rd-22-lr-nickel-polymer-12538
http://www.tandktactical.com/web/image/product.template/12538/image_1920?unique=5c94a59
This replacement or spare magazine is compatible with your Walther Arms PPK/S.