From Third Reich Lugers (Jan C Still), it shows that the Army Test proof of a early (1934-1936) eagle, then mid was a 1936 - 1939 and then the actual nazi eagle was started in 1939.
And in Weimar & Early Nazi Lugers, Jan C Still, in late 1934, the nazi's started to take possession of old and then new lugers and started marking them with their acceptances.
Ed