Walther PPK 9mm Crown/N

Hi, I have a Walther PPK 9mm with a crown over an N, mark in two parts of the slide. The realise bottom for the magazine is in the buttom of the gun. It's in 98% quiality, almost new. I beilive it was made before 1940, cos of the crown over N, but i can't find any similar walther on the net to compare or search for prices. Anybody can tell me more about this gun, and it's value?

On another topic, it's this the same model of the new ppk/s, because there is a laser: Walther PPK/S Laser on amazon dot com
And i want to know if it will fit my gun.

Thanks

I Don't know how to upload pics, but it's the same as in the modern firearms of world dot guns dot ru, the one that say "Rare pre-WW2 variation of Walther PP with bottom-mounted magazine release"

The only problem is that thw crown over N dosent apear so clear, the N is fine but the crown is almost like a circle with lines to the center.

The grip is of a diferent color, brown with a little green, as the bottom of the magazine for the finger.

Pic of the gun

Pic of the Walther

Crown over N