Information on engraved walther PPK requested

Good evening all! I am new to walther PP/PPK’s but not to firearms. I have the opportunity to purchase a “factory engraved walther PPK chambered in 22lr. I am beyond elated to pick this thing up and learn more about it. I have attached a couple preliminary photos of the pistol in question with the hopes of having y’all school me in its history and rough estimate of its value if at all possible!? It’s condition is pristine un fired in its original box.