I'm eyeing a 1978 German-made Walther PPK/S and the gun looks to be in great condition but one thing about it doesn't add up.

Every Walther PPK I've seen has numbers on the ejection port, usually denoting the year it was manufactured but this one has nothing at all inscribed in that area. All other markings on the gun match others I have seen but I find it odd that this one doesn't have the year.

Anyone here have one?