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Also, in this photo that I found on-line, taken from the same meeting you can see
Antonescu shaking hands with the the third man in your photo-- von Ribbentrop.

Ion Antonescu - Wikipedia

The first photo is definitely Marschal Antonescu.

Here you can see on the back of the photo that you posted, part of
Marschal Antonescu's name

That last one, I believe is from Hydrich's funeral.