I picked up a Walther this week that has me curious about this question. The majority I see are prewar guns, and this appears to be a late eagle/N gun, but how late? Looking through Simpsons book they reference serial 43516W I believe it was, as not having any fire proofs as if it was a possible factory pick up? Are they thought to have been produced this late, or would it more likely be a leftover piece from prior production? My rifle is 43323W and is definitely fire proofed, there are four eagle/N’s. Thanks!