The One who appeared to Adam and Eve in the garden, to Abrraham and Moses, and as the Angel of Yahweh to me were all the Preincarnated God the SonWhen God made Himself seen to Moses, he couldn't see His face it would have killed him.
So either it was a preincarnate appearance of Christ that Moses seen, or he actually seen the Father.
If it was the Father, "No man hath seen God at any time" would mean that no man has ever seen the Father in all His Glory.
Personally I believe the Jehovah God of the OT is Jesus Christ, and that is who Moses seen.