Mine is shiny stainless, says interarms made in USA Alexandria Virginia, just like all the others I've seen, are you saying I could be mistaken about the year. I figured the interarms model was only made in the US .
I googled wtb interarms Walther ppks and this site came up. I have exactly what you are looking for, mid 80s Walther ppks interarms .380, original box manual and cleaning rod, 3 mags, brand new recoil springs, extra signature model grip, 2 holsters. Gun is in excellent condition just some very light holster wear, I bought it from a retired cop it was his back up boot gun. Let me know if you want pics and maybe work out a deal.