Bulb

n.

Heard in Cork, Waterford and Clare

The head. Also: to bear a strong resemblance to someone; the very image or spitting image.

In use

Yer man's the bulb off his brother!" "Paddy's small wan is the bulb off the missus

Posh English

That fellow is the absolute image of his brother. Paddy's youngest daughter is the very image of her mother.

Same phrase, other counties