German VK vehicle designation irregularities ingame

So its a pretty basic question I have.

How come the VK 45.01 (P) gets the correct designation (with the dot between the numbers) when the VK 3002 (M) looks a lot more like a postal code? Was it ever actually called VK 3002 (M) or did Gaijins localisation people just not bother to put a dot between the numbers?