The Interarms pistols were actually made in the US by Ranger Mfg in Alabama with US made parts. According to some sources, Ruger supposedly made the slides & frames and shipped them to Ranger for final machining & assembly. Here's some info that may be of help.
The Walther, Interarms/Ranger, S&W arrangement | Walther Forums
The Walther, Interarms/Ranger, S&W arrangement | Walther Forums
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