Greek Contextual Shaping

Greek has a variant form for the final s. However, it turns out that β and ζ also have an initial/non-initial distinction. This can be seen (with a magnifying glass, I might add) in the names Hezekias and Zorobabel; and in Babylon.

You can view the full text of this version of the The Greek New Testament, Stephanus 1550 Received Text with 7678 textual variant notes, containing all the readings of four printed editions at the Bibles Repository hosted by Bibles.org.uk . Thanks to John Hudson for mentioning this resource on the Unicode list (Sun Jul 03 2005 - 20:46:18 CDT).

I understand from John Hudson's post that this is an unusual renaissance font and does not represent a standard for modern or classical Greek. The Didot font with contextual shaping can be seen here.