This is Morei Eushiba as a young man. 1935 approx.
The style is pre war so its aiki jiu jitsu the old fighting method before it was modified to aikido after Morei returned from the war.
We can see the resemblances of aikido here and its origins in the Jiu Jitsu Ryo of style.
The older O Sensei has a quite different grace and presence argueably.