Buy the gun! I have owned a similar Interarms PPK/S .22 since the 1970's, and it is a high quality and totally reliable handgun. It bears no resemblance whatsoever to the Walthers currently being produced by S&W. The gun I own was packaged in an Interarms box like the one you show. Here is a previous thread with a photo:
Walther P-22 - or PPK