Comma placement for a direct address of a noun

Solution 1:

In Language Typology and Syntactic Description: Volume 1, Clause Structure edited by Timothy Shopen an article by WA Foley and R D Van Valin Jr [p 300] contains:

1. Teheran, I don’t care for much.
2. Trevor, I haven’t seen today.
3. As for Alan’s car, he tried to drive it today.
4. That paper, it was a total loss.
5. As for the wombat, it eats roots, shoots and leaves.

This presents examples of two types of construction. 1 & 2 are topicalizations while 3, 4 & 5 are left-dislocations. The difference is that in left-dislocations but not in topicalizations there is a pronoun in the clause that refers back to the clause-initial NP.
[re-formatted so as not to leave jagged edges]

The presence of the comma is common to all. I’d consider the comma in the OSV sentences 1 and 2 optional, or rather context-informed (eg Sun Fredricko and Les Andeles I love, but Elbonia I don’t care for much).

However, some punctuation is necessary in the left-dislocation examples. A comma will suffice and is usual, but for a greater dramatic pause, a dash can be used.

Example 4 corresponds to the original sentence here (without the sentence-connecting 'And').