E.
g.

--"id:GAMMA gamma"-- indicates an uppercase Greek gamma-form followed by the form in lowercase.

Some such exotic parsing as this is necessary to explain alphabetic development because a single symbol may have been used for a number of sounds in a number of languages, or even for a number of sounds in the same language at different times.

Thus, -"id:GAMMA gamma" might very well refer to a Phoenician construct that in appearance resembles the form that eventually stabilized as an uppercase Greek "gamma" juxtaposed to one of lowercase.

Also, a construct such as -- "id:E" indicates a symbol that with ASCII resembles most closely a Roman uppercase "E", but, in fact, is actually drawn more crudely.
5) Dr.Mommsen has given his dates in terms of Roman usage, A.U.C.; that is, from the founding of Rome, conventionally taken to be 753 B.C.