How do they get that sweet acoustic guitar sound in Dire Straits' Romeo and Juliet?

I know that Mark Knopfler plays finger style, but thats all I really know about it.
im quite certain its on a resonator guitar, if that helps
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What exactly is a powerchord?

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My trouser snake is friendly. If you pet him, he might even do a trick! think I'm going to hell for that one.