Ivan you have an amazing Pack HJ collection and this last addition fits in perfectly!
What a true bonus.
Just 1 advise my friend, just find a new host for your website, as i miss you lovely Pack collection!

About the 1939 Knife, well i owned a 1939 WKC Mottoed knife once, and the etch was undoubtful a WKC one, exactly like the 1938 one.
Like your 1939 one its all matches.
IMO they produced the Mottoed blades in 1938, and the RZM logo of 1939 was added in 1939 ( just older stock, why throw away a good blade?

Ger