Glen Scrivener has written a super post on Christ in the Old Testament reminding us that Christ isn’t merely promised and patterned, He is also PRESENT!
He includes some great quotes from Calvin on this subject too, such as:
“[The OT saints] had and knew Christ as Mediator, through whom they were joined to God and were to share in His promises.” (II.10.2).
“The fathers, when they wished to behold God, always turned their eyes to Christ. I mean not only that they beheld God in his eternal Word, but also they attended with their whole mind and the whole affection of their heart to the promised manifestation of Christ.” (Commentary, John 1:18)