The significance is probably created as a result of the hand in the Ulster Banner having it's thumb located away from the palm.
Whilst I've heard of this apparent significance before, no one has ever really explained what it is. So I reckon that if we are both stumped Danny, and GR doesn't know then, there is none perhaps?
Incidentally, above James Buchanan it is away from the palm and above Teddy R it's against the palm.
The plot thickens.
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