Mistake in cover artwork for new Young Bond

According to the published storyline for the new Young Bond, the story takes place in the pre-war era in Los Angeles/Holywood.
However, on the cover there is a picture of a Walther P38 which was NOT introduced until 1940/1941. Has somebody made a mistake in their research because the name P38 does not refer to the year 1938 but to model number 38.
I am sorry if I am coming across as pedantic but this type of mistake starts to spoil a story for me and if it continues in the story, then it is ruined.

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