Lew, that's not likely to be the tang. It's probably a nail used to affix the end-cap/pommel.
Through-tang dha are quite rare in my experience. Mark used an ingeneous test to determine that his Ayutthaya period darb went entirely through the handle to the pommel: string a battery, a lightbulb and a piece of wire to either end of the sword. If the bulb lights up, you've probably got a closed circuit and a full tang (a noteable exception would be seen on swords completely encased in conductive metal).
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